T-SQL (Transact-SQL) is a powerful, procedural language that extends the standard SQL language. It's specifically designed for use with Microsoft SQL Server. While standard SQL focuses on declarative querying, T-SQL allows for more complex, procedural tasks. This includes defining stored procedures, functions, and triggers, which can significantly improve database performance and maintainability. T-SQL also provides advanced features for transaction management, allowing developers to ensure data integrity and consistency. For example, you can use T-SQL to define complex business logic within the database itself, rather than relying solely on application code. This separation of concerns can lead to more robust and maintainable applications. Crucially, T-SQL is not a replacement for standard SQL; instead, it builds upon it, adding functionality tailored to the Microsoft SQL Server environment.