Betta fish fighting fish.

Betta fish are so popular for multiple reasons! First of all it is one of the coolest fish that you can find. You can find bettas in various colors such as red, orange, blue, purple or even some betta that changes color over time called marble betta.
Second betta fish is a great starter fish. They are very easy to maintain and as long as you have 2 gallon of water and a filter you are gucci. Of course you have to keep the fish in tropical temperature (72–78 degrees).
Third betta fish have personalities! They like to do interesting stuff like jump over lily pads, flare at their own reflection and make bubbles.
Fourth, people breed betta fish to discover a new gene that looks better and stronger in general.
Overall betta fish is just so good as display and pets that people actually enjoy keeping them.