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PHP (Hypertext Preprocessor) is a widely-used server-side scripting language primarily designed for web development. It's known for its simplicity, flexibility, and vast community support, making it a popular choice for building dynamic and interactive web applications.

Key aspects and features of PHP programming include:

1. Server-Side Scripting: PHP is executed on the server, generating HTML, which is then sent to the client's web browser. This allows developers to create dynamic web pages, interact with databases, handle form data, and perform various server-side tasks.

2. Embedded in HTML: PHP code can be embedded within HTML, allowing developers to mix PHP with HTML to create dynamic content. PHP code is enclosed within tags.

3. Database Integration: PHP offers built-in support for interacting with various databases, with robust extensions for MySQL, PostgreSQL, SQLite, and others. It allows seamless integration with databases to perform operations like querying, inserting, updating, and deleting data.

4. Security Features: PHP includes built-in security features and functions to help prevent common web vulnerabilities like SQL injection, cross-site scripting (XSS), and more.

5. Scalability: With proper architecture and design patterns, PHP can be used to build scalable and high-performance web applications that handle a large number of users and requests.