When is multi process application is better than multi thread application in a single machine?

Question

I was asked below two questions in an software engineer interview but could not answer. I did goggle search but could not find answer. a. When is multi process application is better than multi thread application in a single machine? b. When is multi thread not possible in a single machine but multi process is possible? JavaScript questions and answers, JavaScript questions pdf, JavaScript question bank, JavaScript questions and answers pdf, mcq on JavaScript pdf, JavaScript questions and solutions, JavaScript mcq Test , Interview JavaScript questions, JavaScript Questions for Interview, JavaScript MCQ (Multiple Choice Questions)

Answer 1

Multi-process is better than multi-threaded when you need to isolation that processes provide to prevent tasks from interfering with each other or the controlling process. This can mean, for example: You want to be able to terminate tasks abruptly. If they are processes, then the OS will ensure that their system resources are released; or You just want to be sure that a task's resources are freed when it completes, even if it completes normally; or You have a (non-adversarial) multi-tenant system; or You want to be sure that tasks do not inadvertently share memory, etc. I'm not sure what the asker wants w.r.t. multi-threading being "impossible", but maybe he is thinking of one of the above scenarios, or just when you're using a host environment like NodeJS that doesn't allow multi-threading.