Bitcoin, first you must understand the basics of how it works. You are connected to the community of Bitcoin users through a computer network, and the ledgers that Bitcoin uses is called a blockchain: transactions are compiled into blocks, which in turn are connected in a chain-like manner, hence the name.
The ledger keepers are called miners, because what they are doing, essentially, sounds very much like gold miners who work hard to find gold: they are working for the reward in the form of bitcoins, which, like gold, are limited in supply.
So now you know how Bitcoin works. What does that have to do with its value?
See more inside our guide to understanding Bitcoin and the Blockchain