Copyright

Copyright is basically someone producing something and then saying its copyrighted, which means that no one else can copy their idea as they had it first.

This is another definition of copyright from Wikipedia: 

"A copyright is a set of exclusive rights granted by a state to the creator of an original work or their assignee for a limited period of time upon disclosure of the work. This includes the right to copy, distribute and adapt the work. In most jurisdictions copyright arises upon fixation and does not need to be registered. Copyright owners have the exclusive statutory right to exercise control over copying and other exploitation of the works for a specific period of time, after which the work is said to enter the public domain. Uses covered under limitations and exceptions to copyright, such as fair use, do not require permission from the copyright owner, but all other uses require permission. Copyright owners can license or permanently transfer or assign their exclusive rights to others". 
How does copyright effect me
Copyright effects my video in several ways, firstly i must make sure that any music that i choose t use in the video i have permission for. It is important that i contact the artist to ask if it is okay to use there track.