SQL Server System Tables are essential components of the database engine, providing a structured way to manage and access the system's metadata. Here's a breakdown of some key system tables:

1. sys.objects: Contains a row for each user-defined, schema-scoped object created within a database, such as tables, views, stored procedures, etc.

2. sys.columns: Holds a row for each column of an object that has columns, like tables or views.

3. sys.indexes: Stores a row for each index and table, including the clustered index for the table.

4. sys.tables: Specifically records all tables in the database, both system and user-defined tables.

5. sys.databases: Lists all the databases managed by the SQL Server instance.

6. sys.sysaltfiles: Shows the files used in all databases.

7. sys.types: Stores a row for each user-defined and system type.

8. sys.partitions: Contains a row for each partition of a table or index.

9. sys.sql_modules: Holds the definitions of Transact-SQL modules, such as stored procedures, functions, and triggers.

10. sys.procedures: Details information about each stored procedure in the database.

These tables are fundamental for SQL Server's functioning and are used extensively for database management tasks. Would you like to explore any specific system table in more detail?