Primary sources are original documents, objects, images, videos, or audio created at the time of the historical period you are studying or researching. They have been created by someone with firsthand experience of an event. In other words, they are not someone's interpretation of something that has occurred in the past or of someone else's account of an event or historic period.
Some examples of primary sources are:
Published books or newspapers from the time under study
Works of Art
As you can see, primary sources can be any number of objects or artifacts. The key thing to remember is that a primary source is a firsthand account or is something created by someone who was there or who witnessed an event firsthand.