What is Concurrency/Concurrent Computing?

Concurrency or concurrent computing refers to the form of computing in which multiple computing tasks occur simultaneously or at overlapping times. These tasks can be handled by individual computers, specific applications or across networks. Concurrent computing is often used in Big Data environments to handles very large data sets. For it to work efficiently and effectively, careful coordination is necessary between systems and across Big Data architectures relative to scheduling tasks, exchanging data and allocating memory.