Which method of contraception is a barrier made from latex and applied to the penis before intercourse?

The method of contraception being described is a condom, which is indeed a barrier made from latex that is applied to the penis prior to intercourse. Condoms are designed to prevent pregnancy by blocking sperm from entering the vagina during sexual activity. They also provide protection against sexually transmitted infections (STIs), which is an additional benefit that distinguishes them from some other contraceptive methods.

In contrast, a Femidom is a type of internal condom that is inserted into the vagina, the implant is a hormonal method of contraception that is placed under the skin, and the pill is an oral contraceptive taken to prevent ovulation. Each of these methods functions differently from a condom, further highlighting why the condom is the correct answer in this context.