It is raining. The streets are wet. The conclusion is connected with the premises in a way that shows that the conclusion must be true if the premises are true. Some of premises are false . In this case the conclusion might be true or it might be false.
All humans are philosophers.
Socrates is a human. The conclusion is NOT connected with the premises in a way that shows that the conclusion must be true if the premises are true. All the premises are true . In this case the conclusion might be true or it might be false. All humans will die.