Jogging is running at a slow speed. Many people go for a jog in order to keep fit and healthy. People go jogging for exercise, not for competitions.
Jogging is a very cheap way of keeping fit, because all that is needed is a good pair of running shoes. One can jog anywhere, although it is good to stay away from main roads where the air is full of traffic fumes. It is also good to avoid too much jogging on hard pavements (sidewalks).