I have recently found little dead bugs on windowsill and I wonder what they are and if they are a threat?

Question:they are very tiny but clearly visible. a little smaller than a bb. the best description i can give is they look like little dark colored ladybugs. there are a lot of dead ones all over windowsill and a few live ones here and there

Answers:
Your description is vague but my guess is TERMITES

Do you notice any small wings on the bugs or on the ground

Look for what appears to be pin holes in the walls with dirt around them or dirt in the cracks near the sills - which would confirm termites