When you share or publish content to "Everyone," that means anyone on the internet is able to view it. This includes people who are not your friends on Facebook, and people who are not in your school or work networks. You should use this setting to publish things that you are comfortable making open to anyone.

If someone can see something you published to "Everyone," this doesn’t necessarily mean they will be able to view all information on your profile. What people can see when they go to your profile is determined by what your different profile privacy settings allow.