Depending on the watersport you want to get involved in, there is a lot of different specialised equipment you will need to be able to take part in the activity. For example if you want to learn to wakeboard then you will need to actually buy a wakeboard and there are many different ones to choose from. Meanwhile if want to waterskii you will need the waterskiis. Either would be useless for the other sport but they are nonetheless very important props to take part in the activities.
However there are also some items that will be useful for a range of different watersports and more that will be useful for watersports that involve being towed behind a boat such as waterskiing or wakeboarding.
For almost any watersport a wetsuit will be very useful for instance. And these will be practical for a lot of other activities as well that involve getting wet. These are essentially skin tight suits that help to keep your skin dry while you’re in the water.