PL/SQL stands for Procedural Language/Structured Query Language. It is a programming language used in Oracle databases to enhance the capabilities of SQL. PL/SQL allows developers to write complex database applications by combining SQL with procedural constructs like loops and conditionals, making it easier to manage and manipulate data. With PL/SQL, users can create stored procedures, functions, and triggers, which help automate tasks and improve performance. This language supports error handling and allows for modular programming, enabling developers to write reusable code. Overall, PL/SQL is essential for building efficient and robust applications within the Oracle ecosystem.