What is tab lock in sqlserver?

In SQL Server, a tab lock is a type of locking mechanism that applies to an entire table during certain operations, such as INSERT, UPDATE, or DELETE. It prevents other transactions from modifying or accessing the table until the lock is released, ensuring data integrity during these operations. Tab locks are typically used in operations that affect multiple rows or the entire table, and they can be either shared or exclusive, depending on the operation being performed. This locking strategy helps manage concurrency and prevent issues like dirty reads and lost updates.