What exactly does the contrast ratio and response time mean?

Recently I have been browsing for external monitors and I noticed that two of the specifications for monitors are a contrast ratio and response time.
What does a contrast ratio mean? What does the response time mean? Is the response time the same as the frequency refresh rate (ie. 75 Hz)?
I was looking at the Thunderbolt Display specs and it has a contrast ratio of 1000:1 and a response time of 13ms, but another LED monitor that costs 1/3 the price has a contrast ratio of 5,000,000:1 and response time of 5ms. The resolution of the display does not matter too much for me. Would the cheaper monitor be a better choice for me if I play to mostly use the display for gaming/photo editing?

You're welcome.
Would the cheaper monitor be a better choice for me if I play to mostly use the display for gaming/photo editing?
You can problem find lots of decent monitors with short response times for gaming. But I think (and this is just a guess, no basis in fact) that a decent monitor for photo editing may not be cheap and of course response time doesn't much matter so it may not make a good game monitor (depending on the kind of games you like to play of course -- angry birds would play on anything).
Also another thing to keep in mind are the two schools of thoughts on glossy monitors like the current 27" Apple monitors vs. non-glossy (anti-reflective) monitors. It's like religiion, And one group is not going to convience the other which is "better". It's a matter of taste I think. There's even a thread on this topic in these forums:
Why is Apple insisting on Glossy Displays?
I'm only mentioning this because if you want to do some photo editing there are some folks who do that stuff and claim they don't like glossy displays.

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