Time sharing ias a method where multiple users can use the same computer at the same time, where each individual could have their own login into computer.
This way, one person can log into computer perform a task, and another person can log into the same computer using their separate account and share some of the computer resources, such as processor time, memory, the ability to store data and thinks like that so they can perform their own separate taks.
Time sharing was popular around '60s