PHP is an open-source scripting language used for web development. It is a server-side language that can be used to create dynamic websites, applications and developing web-based software. It is also used to create powerful interactive webpages easily and quickly. It is compatible with many operating systems and databases and supports both procedural and object-oriented programming. It is user-friendly and is considered easier to learn than other languages like Python and Java. Additionally, its security features make it a secure choice for developing applications. Overall, PHP is an ideal choice for web development that offers powerful functionality, scalability, and flexibility.