Seconds later, your recipient receives a link. If they are on a laptop or PC, they will see you on a Google Map -- it can be street or satellite view. Your icon will be moving in near real time, and your speed will be displayed. If you have selected a destination, it will show up on the map as well. It doesn't get easier than that.
If the other person has Glympse on their phone, they have the option to have the app's built-in map display your location. If you want to cut off a viewer before their allotted time is up, you can "expire" them. You can send your location to multiple people, which they can view simultaneously. I've used the app to let people know that I'll be late for a meeting or to display my position in traffic. You can also share your locations to Facebook or Twitter.