Transact-SQL is a Microsoft extension of SQL that adds a set of procedural programming constructs that deal with data manipulation and transaction control. Coursera's Transact-SQL catalogue teaches you how to manage, manipulate, and retrieve data in Microsoft SQL Server and Azure SQL databases. You'll learn key concepts such as writing SQL queries, creating stored procedures, triggers, and functions, managing database transactions, as well as optimizing database performance. Additionally, you will understand how to work with complex data structures and perform advanced data analysis for real-world applications. This knowledge is essential for database administrators, data analysts, and developers who work with SQL databases.