Can you explain what is meant by the concept of competition in programming?

Concurrency in programming is a situation where multiple threads or processes attempt to access the same resources (such as variables, files, databases) simultaneously. This can lead to incorrect results or errors if proper synchronization is not implemented.

In iOS, to address concurrency issues, GCD (Grand Central Dispatch) and queue operations are often used, which allow managing parallel code execution and ensuring safe access to shared data. For example, a serial queue can be used for sequential task execution to avoid data races.