TeamViewer is a third-party program that lets one computer take over the control of another. It is an excellent product for helping others and either doing something for them or showing them how to do things. themselves. It's very easy to use on both ends of the connection. I've used it numbers of times, to help friends and relatives and I like it much better than what Microsoft offers. It's free for non-business use.
However, you should be very careful not to use it to let anyone take control of your computer, unless it's someone who you know and trust implicitly, both with regard to their honesty and technical skills.