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What is latches in sql server

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Microsoft SQL Server provides counters to monitor internal SQL Server resource called latches.Monitoring the latches to determine user activity and resource usage can help you to identify performance bottlenecks like Average Latch Wait Time,Waits/sec

We can monitor the performance by using cpu usage and memory usage what is use of latch.
Latches are light weight locks which SQL server acquires for pages in buffer.

Latch is a synchronization mechanism between threads.Latch protects access to in memory data structures. latches are lightweight as compare to locks. the best example to understand latch is TEMP DB LATCH CONTENTION.
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