(written from a Production point of view)
Product placement refers to a form of advertising in which branded goods are incorporated into the content of entertainment such as television shows and movies. Due to its futuristic setting, product placement is relatively rare in Star Trek productions. To date, it has only appeared in several of the films.
In the documentary POM Wonderful Presents: The Greatest Movie Ever Sold, J.J. Abrams was interviewed regarding the product placement in his films, including Star Trek. Abrams noted that it was a "necessary evil", which has to be minimized so that it does not interfere with the creation of a fictional world. 
Brands that have been featured in Star Trek include:
- Michelob, Macintosh, Pacific Bell (Star Trek IV: The Voyage Home)
- Levi's jeans, Jack Daniels (Star Trek V: The Final Frontier)
- Nokia and Budweiser Classic (Star Trek)