Cam4 is a token based cam site similar to Chaturbate, Camsoda and the European brands Bongacams & LiveJasmin. That means, you don't necessarly have to signup to see naked people. There are tousands of webcams online the whole day trough and you get cams for all "bigger" countries, like the US, UK, as well as German, Spain and many more.
There is no need so sign up to see some action, but of course it makes things way easier for you. With a registration you don't have any costs at all and you can subscribe to cams, so you don't miss a show of your favorite host. Also, you can chat with other people and -if you have the body and attitude- can make your own shows if you want to.
If you decide to spend some dollars for tokens to buy extra content or tip your hosts, you can buy 50 up to 1000 tokens at once. 50 tokens cost $9.95, while you get 1000 for $159.99. For your first purchase, you also get 50 for free.
You can also upgrade to a gold membership for $9.9 a month to remove all ads from cam4, to send private messages to a host and to watch all cams in full screen. No ads and private messages are cool, but the big advanted of a full screen is... at least questionable. As a bonus, you also get 100 tokens for the upgrade.
From the top menu you can pick what you want to watch: girls, men, couples and even transgender. I did not check the amount of cams in the "prime time", but even in the middle of the night (US time) there were nearly 50 TS cams online. And a few hundred for all other channels. If you are not sure where to go in the beginning or if you are already fed up with crawling just the main tabs, you can also have a look in their other menu options, like "popular tags", Fanclubs and shops, where you can buy special clips from camhosts - over their partner-portal cam4red.
Cam4 is really a very good cam with a lot of good cams and options with actually no downsides. Apart from the fact, that not all cams are in HD - But you can't blame the website for the lack of technical equipment of their hosts.