Two unknown computers show up under "shared." What does this mean?

When I open a finder window, two computers that are unknown to me show up under "shared." What does this mean?
Does this mean someone has broken into my wireless network? Or that these people have access to my files? I don't want to be "sharing" anything with people I don't even know.

It means two of your neighbors also have a wireless network. They cannot access your computer unless you give them your userid and password.
Go ahead and try to access their computers. Unless they have guest sharing turned on, usually to share photos with family and friends, you will not be able to access their computers.
I’m on a university network and have hundreds of names in the Shared section of my sidebar, but do not have access to their computers, nor theirs to mine.

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