How do you create flash flv on website?

I don't know much about internet media. How do people create those video on youtube, etc.?So those latest digital camera will save your recorded video in flash flv format? Is it some model will do that or all of them can do that now? I think u save or convert your video to flash flv format first then you can upload to youtube or other media website.Is that correct? Any help will be great. more video to flv converter can help you do that, you also can convert video to flv(flash video) to publish to your personal website or blog,flv compatible player then share with your family and friend and others like youtube, here it is a guide about how to convert video to flash video step by step,