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Atomik variables are special objects provided in Java by the java.util.concurrent.atomic package, which ensure read and write operations without race conditions, i.e., atomically, without the need to use synchronization (synchronized). They allow safe modification of values in a multithreaded environment, preventing visibility and concurrent access issues.

For example, AtomicInteger allows increasing the value of a counter without locks:

AtomicInteger counter = new AtomicInteger(0);
counter.incrementAndGet(); // atomic increment

The role of atomic variables is to improve performance and simplify code when working with shared variables in multithreaded programming, avoiding the costs associated with locks.