black-and-white thinking

[Jesse20]

Hi...
I always hear this phrase but I do not understand what it means exactly
black and white
I mean like in this sentence "black-and-white thinking"
or you see the world in black and white
not black and white TV or movie
I read a post in this site mentioned this sentence and I got curious to know what it exactly means
{"There is nothing enlightened about shrinking so that other people won’t feel insecure around you."
what do the underlined words mean in the sentence?

[rewboss]

If you see everything in black-and-white terms, it means you think there is a very simple answer to everything -- usually, people are either good or bad, heroes or villains. For example, if you think that all Arabs are terrorists and all white Americans are law-abiding citizens, you're probably seeing the world in black-and-white terms. George Bush's declaration that "you are either with us or with the terrorists" is an example of this: it means that anyone who doesn't support his "war on terrorism" is a terrorist.

[Jesse20]

hi rewboss
Once a friend of mine called me and asked me to fetch him a certain book
tommorow at college . he needed it badly .I forgot about it coz I had a really difficult exam and I was so confused when we met each other the next day he just got upset and didn't give me a chance to apologize or even tell him my excuse and went away. That person sees the world in black-and-white terms.
That what I understood from your explanation

[Hanabi]

Taking the politics out, it means you see things one way or the other, with no in between. Like rewboss said, it's a simple way of looking at things.