We use the word and and or many times in every day language. Consider the following statements.
I will cook lunch and I will clean the room.
I will cook lunch or I will clean the room.
In the first statement, the speaker implies that he will do both things. He will cook lunch and clean the room. Of course, it doesn’t matter if he will do these things separately or which will he do first. The word and in this statement means that he will do both chores.
In the second sentence, the speaker implies that he is choosing between cooking lunch and cleaning the room. Although he may do the other thing later, but at that particular moment, the word or in this statement means that he is trying to choose to do one of the two chores. » Read more