Web Development Beginner

What is AJAX?

A technique for making asynchronous HTTP requests from a web page without reloading the entire page.

AJAX (Asynchronous JavaScript and XML) enables dynamic page updates by fetching data from the server in the background. Originally using XMLHttpRequest, modern JavaScript uses the Fetch API: fetch('/api/data').then(r => r.json()).then(data => updateUI(data)).

AJAX revolutionized web development by enabling single-page-like experiences. Common uses include form submission without reload, infinite scrolling, auto-complete search, live notifications, and real-time dashboards. Despite the name, JSON has largely replaced XML as the data format.

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Storing copies of frequently accessed data in faster storage to reduce load times and server processing.

API Rate Limiting

A strategy for limiting the number of API requests a client can make within a specified time window to protect server resources.

A set of browser-native APIs for creating reusable, encapsulated custom HTML elements with their own styling and behavior.

A query language for APIs that lets clients request exactly the data they need, reducing over-fetching and under-fetching.

An automatic OPTIONS request sent by browsers before certain cross-origin requests to check if the actual request is permitted.

MVC (Model-View-Controller)

An architectural pattern that separates an application into three components: data (Model), interface (View), and logic (Controller).

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