{"id":3434,"date":"2025-10-05T00:00:00","date_gmt":"2025-10-04T22:00:00","guid":{"rendered":"https:\/\/tecnologia.euroinnova.com\/javascript\/"},"modified":"2025-10-08T13:13:50","modified_gmt":"2025-10-08T11:13:50","slug":"what-is-javascript","status":"publish","type":"post","link":"https:\/\/tecnologia.euroinnova.com\/en\/que-es-javascript","title":{"rendered":"JavaScript"},"content":{"rendered":"<p dir=\"ltr\"><strong>JavaScript<\/strong> is<strong> a lightweight, client-side interpreted programming language<\/strong>. It is a fundamental tool in web development, <strong>allowing web pages to be dynamic and interactive<\/strong>. It was originally designed by programmer Brendan Eich in 1995 and is now a de facto standard supported by all modern browsers.<\/p>\n<p dir=\"ltr\">Technically, <strong>JavaScript is a high-level, dynamically typed language.<\/strong>, This means that it is not necessary to declare the type of a variable before using it, as it is determined at runtime. This allows for more flexibility in the code and faster testing of different ideas.<\/p>\n<p dir=\"ltr\"><strong>JavaScript code runs in the client's web browser<\/strong> (the user's device). When a web page containing code <strong>JavaScript <\/strong>is loaded, the browser interprets and executes the JavaScript code directly on the user's device and not on the server hosting the website.<\/p>\n<h2 dir=\"ltr\" id=\"para-que-sirve-javascript\">What is JavaScript for?<\/h2>\n<p dir=\"ltr\"><strong>One of the most distinctive features of JavaScript<\/strong> is its ability to manipulate the DOM (Document Object Model). The DOM is a representation of the content of a web page that allows JavaScript to interact with elements of a web page. <a href=\"https:\/\/tecnologia.euroinnova.com\/en\/html\/\">HTML <\/a>and CSS to dynamically change its content and style.&nbsp;<\/p>\n<p dir=\"ltr\">Thus, <strong>JavaScript can respond to user events<\/strong>, The user can click a button or submit a form, and update the content of the page without reloading it.<\/p>\n<p dir=\"ltr\">In addition to the DOM, <strong>JavaScript can also be used on the server side<\/strong> (front-end) through platforms such as Node.js. This gives it the ability to perform server-side tasks such as interacting with <a href=\"https:\/\/tecnologia.euroinnova.com\/en\/database\/\">databases<\/a>, The programme is designed to help you to manage network requests and to create complete web applications.<\/p>\n<p dir=\"ltr\">Here is a summary of what JavaScript can be used for:<\/p>\n<ul>\n<li dir=\"ltr\"><strong>DOM manipulation:<\/strong> Allows you to access and modify the HTML and CSS elements of a web page. In other words, add, delete or modify elements and styles in real time.<\/li>\n<li dir=\"ltr\"><strong>Event management:<\/strong> JavaScript can detect and respond to user events such as button clicks, form submissions, mouse movements, etc. in order to create richer and more personalised interactions with website visitors.<\/li>\n<li dir=\"ltr\"><strong>Validation of forms:<\/strong> It is common to use JavaScript to validate the data entered by users in forms before sending it to the server in order to provide a <a href=\"https:\/\/tecnologia.euroinnova.com\/en\/experiencia-de-usuario-ux\/\">user experience<\/a> more user-friendly and avoid sending incorrect data.<\/li>\n<li dir=\"ltr\"><strong>Animations and visual effects:<\/strong> With <strong>JavaScript <\/strong>attractive animations and visual effects such as carousels, smooth scrolling, colour changes and much more can be devised.<\/li>\n<li dir=\"ltr\"><strong>Dynamic content loading:&nbsp;<\/strong>Allows you to load additional content on a web page without having to reload it completely.<\/li>\n<li dir=\"ltr\"><strong>Communication with the server:<\/strong> Through HTTP requests, JavaScript can communicate with the server to obtain or send data asynchronously. When JavaScript communicates asynchronously with the server, the loading of the rest of the code is not interrupted, so the user can continue to browse the web page while waiting for a response from the server.<\/li>\n<li dir=\"ltr\"><strong>Web application development:<\/strong> Thanks to Node.js, JavaScript can also be used on the server side (back-end) to develop complete web applications, which allows the programming language to be unified throughout the project.<br \/>&nbsp;<\/li>\n<\/ul>\n<h2 dir=\"ltr\" id=\"es-lo-mismo-java-que-javascript\">Is Java the same as JavaScript?<\/h2>\n<p dir=\"ltr\">No<strong>, Java and JavaScript are not the same<\/strong>, Despite their similar-sounding names, they are two completely different programming languages.<\/p>\n<p dir=\"ltr\">Java is an object-oriented programming language devised by Sun Microsystems (now owned by Oracle) with which software applications are developed. As we have already mentioned, JavaScript is a programming language designed for both front-end and back-end web development.<\/p>","protected":false},"excerpt":{"rendered":"<p>JavaScript es un lenguaje de programaci\u00f3n ligero e interpretado en el lado del cliente. Es una herramienta fundamental en el [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":4316,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-3434","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sin-categorizar"],"acf":[],"_links":{"self":[{"href":"https:\/\/tecnologia.euroinnova.com\/en\/wp-json\/wp\/v2\/posts\/3434","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/tecnologia.euroinnova.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/tecnologia.euroinnova.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/tecnologia.euroinnova.com\/en\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/tecnologia.euroinnova.com\/en\/wp-json\/wp\/v2\/comments?post=3434"}],"version-history":[{"count":0,"href":"https:\/\/tecnologia.euroinnova.com\/en\/wp-json\/wp\/v2\/posts\/3434\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/tecnologia.euroinnova.com\/en\/wp-json\/wp\/v2\/media\/4316"}],"wp:attachment":[{"href":"https:\/\/tecnologia.euroinnova.com\/en\/wp-json\/wp\/v2\/media?parent=3434"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/tecnologia.euroinnova.com\/en\/wp-json\/wp\/v2\/categories?post=3434"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/tecnologia.euroinnova.com\/en\/wp-json\/wp\/v2\/tags?post=3434"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}