Both take pictures with a digital sensor and image quality is equivalent. The difference is when composing the picture:
In a mirrorless camera, you are looking at an electronic screen.
In a DSLR, you are looking directly through the lens (with that mirror.)
Because the electronic screens didn’t have enough resolution in the past, DSLR cameras gave better control over focus. With DSLR there is also often also an option to temporary reduce/increase the shutter to the same F-stop (size) as when taking the picture so you really can see the effect it will have before actually take a picture.
Off course DSLR also has drawbacks. (weight, fragility, vibration, size, always distance between sensor and lens to allow mirror, …)
As electronic screens become better and better, this main disadvantage becomes less and less important.
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