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PHP is a widely-used, open-source scripting language especially suited for web development. Here's a breakdown of key aspects: 1. Core Concepts: Server-Side Scripting: PHP code is executed on the server, generating HTML (or other output) that is then sent to the user's browser. This distinguishes it from client-side languages like JavaScript, which run in the browser. Embedding in HTML: PHP code can be directly embedded within HTML, making it easy to create dynamic web pages. Dynamic Content: PHP allows you to generate content that changes based on user input, database information, or other factors. Database Interaction: PHP readily connects to various databases (like MySQL, PostgreSQL), enabling you to store and retrieve data. 2. Key Features and Characteristics: Open Source: PHP is free to use and distribute. Cross-Platform: It runs on various operating systems (Windows, Linux, macOS). Large Community: A vast community provides support, resources, and libraries. Web Framework...

An API (Application Programming Interface) is a set of rules and protocols that allow one software application to interact with another. It defines the methods and data formats that applications use to request and exchange information. APIs are used to allow different systems, services, or components to communicate with each other. APIs typically work by defining endpoints (URLs) where one system can send requests, and the system receiving the request processes it and sends a response back. Here's a basic overview of how the process works: 1. Client (Requester): The system (or program) that initiates the request. This could be a user interacting with an app, or a program that needs to fetch data from another service. 2. API Endpoint: An endpoint is a specific URL or URI (Uniform Resource Identifier) on the server that defines where the request should be sent. 3. Request: The client sends an HTTP request to the API endpoint. This can be one of several types: GET: Retrie...