Partition Tolerance is a concept in distributed systems that refers to the ability of a system to continue functioning even when network partitions occur. A network partition happens when there is a failure in communication between different parts of the system, preventing them from exchanging information. In such cases, a partition-tolerant system can still operate, ensuring that some parts of the system remain available to users. In the context of the CAP Theorem, which stands for Consistency, Availability, and Partition Tolerance, it is one of the three key properties that distributed systems must balance. While a system can achieve two of these properties at a time, it cannot guarantee all three simultaneously during a network partition. Thus, understanding Partition Tolerance is crucial for designing resilient distributed systems.