The purpose of any condom is the same – to act as a protective shield between a sperm and an egg and avoid pregnancy and STDs/STIs.
Coming to a woman’s condom…
To put it simply, it is a protective covering inserted into a woman’s vagina before having sex.
To explain it in detail, it is a soft, loose-fitting pouch, with a ring on each end. The ring inserted into the vagina holds the female condom in place. The ring at the other end (the open end) remains outside the vagina, helping keep the condom in place and also allowing easy removal.