The Academic Community and You
As a student you are a member of the academic community. Just like membership in other communities, you are expected to follow the rules to remain in good-standing. For academics, one of the most important rules of the group is giving credit to others when you use their work and ideas (cite your sources). Secondly, as scholars, publishing false and misleading information is not only bad behavior it can also harm the scholarship possibilities of other academics (pay careful attention to your research). Of course there are many other cultural norms in this community, but if you abide by these two you will not have a problem.
Three Types of Plagiarism
Effective Ways to Avoid Plagiarism