# Overview of Multithreaded Development

During ArkTS application development, different service scenarios demand different types of concurrency and corresponding task types.

There are three types of concurrent tasks in common service scenarios:

- [Time-consuming tasks](time-consuming-task-overview.md): These involve significant computation or multiple I/O operations and take a long time to execute.

- [Continuous tasks](long-time-task-overview.md): These include tasks like listening or periodically collecting data that need to run continuously over extended periods.

- [Resident tasks](resident-task-overview.md): These are bound to the lifecycle of the main thread or closely integrated with it.

Each task type can be further categorized. For example, time-consuming tasks can be CPU intensive, I/O intensive, or synchronous, each corresponding to different service scenarios. Choose the appropriate concurrency capability based on the specific scenario.

The following sections will list common scenarios and examples in multithreaded development.