The term "Isolation Level" refers to the degree to which the operations in a database transaction are isolated from one another. It determines how changes made by one transaction are visible to other transactions. Different isolation levels can help manage issues like data inconsistency and concurrency, which can arise when multiple transactions occur simultaneously. There are four main isolation levels defined by the SQL standard: Read Uncommitted, Read Committed, Repeatable Read, and Serializable. Each level offers a trade-off between performance and data integrity, allowing developers to choose the appropriate level based on the specific needs of their applications.