In its simplest form: the softer the tyre, the faster the lap time, but the faster it wears out and loses those benefits.
Harder tyres last longer, but are slower.
So it is a balance between fast lap times offset by more pit stops or a slower tyre and less pit stops.
Tortoise and Hare analogy.
[Chainbear](https://youtu.be/wqf-dJyU_WA) does a variety of great and easy to understand videos on numerous aspects of F1
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