A single threaded application includes only one thread which responsible for executing every task and method, one after the other, and the controller doesn't move to the next task until the previous one ends. More to that, the main thread doesn't exist until all the tasks are done executing.

What are examples of single threaded applications?

7Zip, the file compressor/decompressor, is another good example of a multi-threaded application. LAME, the open source audio encoder, is a good example of a single-threaded application.

What are multi-threaded applications?

A multi-threaded application is an application whose architecture takes advantage of the multi-threading provided by the operating system. Usually, these applications assign specific jobs to individual threads within the process and the threads communicate, through various means, to synchronize their actions.