Where are thrusters located?

Excuse me, could you please clarify for me where the thrusters are typically positioned on a spacecraft? Are they positioned at the rear or are there specific locations where they are most effective in propelling the craft? Additionally, does the location of the thrusters vary depending on the type of spacecraft or mission it is designed for? I'm eager to learn more about the intricacies of spacecraft design and how thrusters play a crucial role in its functionality.