Cryptocurrency mining power is rated on a scale of hashes per seconds. A rig with a computing power of 1kH/s is mining at a rate of 1,000 hashes a second, 1MH/s is a million hashes per second and a GH/s is one billion hashes per second. Every time a miner successfully solves a block, a new hash is created. A hash algorithm turns this large amount of data into a fixed-length hash. Like a code if you know the algorithm you can solve a hash and get the original data out, but to the ordinary eye it's just a bunch of numbers crammed together and remains practically impossible to get the original data out of.
