Philosophy is not:

1. Winning arguments

2. Pointless questioning

3. Simply expressing one's beliefs

4. Attempting to support your opinions any way that you can

5. Doubting everything

6. Justifying emotions or prejudices

 

Philosophy involves:

1. Attempting to locate conflicts or contradictions among statements held to be true

2. Attempting to use rational arguments to resolve or dissolve the conflict or contradiction

 

But what is philosophy? That is a philosophical question! Here is one answer that you might consider:

Philosophy is critical thinking about questions that matter.