Difference between web app and desktop app in terms of processes and threads

this is my first time on StackOverFlow, so I hope I could explain myself clearly. I'm a beginner in coding, btw I'd like to know if there are any differences between web apps and desktop apps concerning threads and processes. I've read other general questions and answers about differences between web apps and desktop apps, but my focus is specific on thread and process. Thank you all in advance!