What is the difference between time domain and frequency domain?

If a signal passes 1000 times in one second we say that its frequency is 1000. So one signal is moving in 1000th part of a second. It means, we can view a signal in terms of time. But I've heard that there are two domains, i.e. time and frequency. How they relate to each other and whats the difference between... show more If a signal passes 1000 times in one second we say that its frequency is 1000. So one signal is moving in 1000th part of a second. It means, we can view a signal in terms of time. But I've heard that there are two domains, i.e. time and frequency. How they relate to each other and whats the difference between them? If we view frequencies in terms of frequency domain, does time axes still exist?
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