Cheating means to make your results appear better than they are, or to sabotage others to put your own work in a better light. Plagiarism is the use of a piece of work without proper credit being given. Both are serious offences. The department are obliged to report suspicions of cheating or plagiarism to the Disciplinary board, who carry out an investigation and decide if any penalties are required. It is important to remember that the intention to cheat can be enough to be found guilty. One example could be if you have prepared to be able to cheat by bringing material with you to an exam that is no allowed, but never use it.
You can find more information about cheating, how it is investigated and penalised here:
What constitutes cheating or plagiarism can be difficult to konw, hopefully this will help clarify it:
At the Chemical centre several teachers use urkund, a program that is used by many universities and colleges in Sweden, to detect plagiarism. The program does not detect if something is plagiarism, but simply compares an uploaded text with published material and all texts previously uploaded to urkund and indicates similarities. The teacher will then review the results of the program and decide if there is suspected plagiarism.
Urkund has a good guide that explains the different types of plagiarism, together with different examples. You can download it here: