A male condom is a contraceptive.
It is made of very thin latex or polyurethane depending on the type. A condom covers the penis and acts as a barrier between the penis and the vagina, the penis and the mouth or the penis and the anus. A condom works by catching the sperm when the man ejaculates (cums) stopping it from entering the vagina, anus or mouth.
Male condoms are 98% effective if used correctly. They are also one of the only methods that protect against both pregnancy and STIs. However, remember that condoms are not effective if they are not put on properly or are the wrong size as they can slip off.