Concurrency is one topic engineers notoriously get wrong, and understandibly so, because the brain does juggle many things at a time and in schools linear thinking is emphasized. Yet concurrency is important in any modern system.
Concurrency is about parallelism, but inside the application. Most modern languages have an in-built concept of concurrency; in Java, it's implemented using Threads.
A classic concurrency example is the producer/consumer, where the producer generates data or tasks, and places it for worker threads to consume and execute. The complexity in concurrency programming stems from the fact Threads often needs to operate on the common data. Each Thread has its own sequence of execution, but accesses common data. One of the most sophisticated concurrency libraries has been developed by Doug Lea and is now part of core Java.
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