Yes! They can improve soil tilth (or texture and ability to hold moisture), aeration (or air in the soil), infiltration rate (or the rate at which water movies into the soil), and drainage. Also, when they die their bodies provide nutrients for plants.
I just wanted to add a few things to sfincher’s answer. Earthworms also excrete substances that can reverse harmful pH balances in the soil. Their movement helps better distribute the nutrients of the soil and can reduce soil erosion. In short, they are absolutely wonderful for soil!
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