"Copyright" refers to the right to copy and display, distribute, or sell a creative work (like a painting, movie, song, video game, novel or other creative work).  The copyright in any creative work is first owned by the person who creates it (like the artist or writer).  

But the copyright can also be sold or given away by its owner. (Example musicians often sell the copyright to a song recorded to a record company.) The owner may also give other people  permission to temporary sell, display, or give away the work.

Sometimes called "piracy," the crime of internet copyright infringement is basically copying, uploading, or sharing a creative work without the permission of the owner.  It does not matter if the person sharing the work profits from the distribution of the material or not.