We have received this particular question quite a lot so we wanted to help and address the issue!
Q: I noticed this web on my tree this morning. What is it?
A: Those are called tent caterpillars. They "overwinter" as eggs on twigs, mostly on aspens. If it is a small web like the one shown, the easiest way to take care of them is to cut the branch, drip the web in soap and water. place in a plastic bag, secure the bag, and dispose in the trash.
If it is a larger infestation, you would need to spray insecticides that contain Bacillus Thuringiensis which is commonly used in organic farming.
Hoping everyone a wonderful weekend!