In photography, there are two types of lenses: zoom lenses and prime lenses. Zoom lenses cover a range of focal lengths. If you’ve just bought a new DSLR, the kit lens that comes with your camera is almost certainly a zoom lens; most come with an 18-55mm lens, which means that lens covers every focal length between 18mm and 55mm. A prime lens, on the other hand, covers just one focal length. A 50mm lens is just a 50mm lens.

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by Harry Guinness #HowToGeek
https://www.howtogeek.com/310004/what-are-prime-camera-lenses-and-why-would-you-use-them/