From Monday until Friday most people are busy working or studying, but in the evenings and on weekends they are free to relax and enjoy themselves. Some watch television or go to the movies; others participate in sports. It depends on individual interests. There are many different ways to spend our spare time.
Almost everyone has some kind of hobby. It may be anything from collecting stamps to making model airplanes. Some hobbies are worth a lot of money; others are valuable only to their owners.
I know a man who has a coin collection worth several thousand yuan. A short time ago he bought a rare ten-yuan piece worth 250 yuan. He was very happy about the purchase and thought the price was reasonable. On the other hand, my son collects match boxes. He has almost 600 of them but I doubt if they are worth any money. However, to my son they are extremely valuable. Nothing makes him happier than to find a new match-box for his collection.
That's what a hobby means, I guess. It is something we like to do in our spare time simply for the fun of it. The value in money is not important, but the pleasure it gives us is.