Fallacy is the use of faulty arguments which are not valid and as such are rendered untrue because of the way they are presented in the argument. Some fallacies look valid, but are still fallacious because they do not satisfy an important logical premise.

As a result of this, we can see that there are various types of fallacy and they include:

Fallacy of Hasty Generalisation
Argumentum ad Baculum
Argumentum ad Hominem
Slippery Slope

For example, when we use Argumentum ad Baculum (appeal to force), we try to make use of force to silence a person who has made a very valid and logical argument.

For example, when you tell a person, "I will soon slap you if you do not close up your mouth" is an appeal to force or Argumentum ad Baculum

Please note that your question is incomplete so I gave you a general overview so that you would get a better understanding of the concept.