Database Systems are systems used to manage and administer digital databases, providing efficient ways to organize, store, and retrieve large amounts of data. Coursera's Database Systems catalogue teaches you the fundamentals of database management, data models and relational database design. You'll learn about Structured Query Language (SQL), NoSQL databases, database normalization and indexing, transaction processing, and the design and implementation of database systems. This skill set is invaluable for data analysts, software engineers, IT administrators, and those aspiring to roles that utilize these systems. Mastering tools such as MySQL, Oracle, MongoDB, and PostgreSQL will significantly enhance your capabilities in handling, analyzing, and managing data.