A bikini is a type of swimsuit for women that has two parts: one part for the top and one part for the bottom.
Bikinis are for swimming and being at the beach. They are also for looking good and feeling good.
Examples:
She wore a red bikini at the beach.
I need a new bikini for our vacation.
The bikini is blue and white.
I think my dad should wear a bikini!
In the future, everyone will wear bikinis all the time.
The bikini is the best thing to wear at the beach.