First Olympic Year:
Ever since the start 1896. There was a gap in 1912, the Swedes don't like banked roads. Women started in 1988.
Almost immediately after the popularity of bikes. People decided to race bikes. People wanted to see biking. This means that someone wanted to make money on people wanting to watch the people racing on bikes.
Track cycling allowed an easy way to put a lot of people in a stadium and charge prices. Plus, banked tracks!
There are many different events that have come in and out of the sport. The Olympic events in track cycling have not even been consistent throughout the years. Just know, usually the fastest is the best.