Java ConcurrentSkipListMap is a concurrent, thread-safe map implementation that supports concurrent read and write operations. It uses a skip list for maintaining a sorted order, allowing for fast lookups, insertions, and deletions. Introduced in Java 2004 with Java 5, ConcurrentSkipListMap is part of Java's java.util.concurrent package and is used in applications that require a sorted map with high concurrency, such as in caching, indexing, and multi-threaded processing.

https://docs.oracle.com/javase/8/docs/api/java/util/concurrent/ConcurrentSkipListMap.html