Hashrate is the measuring unit of the computing power completing an operation in a proof-of-work blockchain. It can be used to measure an individual mining machine, a group of machines, an entire pool or the entire network.
If a mining machine is running at 10 TH/s, it means it can make 10 trillion calculations per second.
For some mining algorithms such as Equihash, hashrate is represented by sol/s instead of H/s. There is essentially no difference, as sol/s also represents the number of calculations per second.
Quick conversion guide:
1 EH/s = 1,000 PH/s = 1,000,000 TH/s
1 TH/s = 1,000 GH/s = 1,000,000 MH/s = 1,000,000,000 KH/s = 1,000,000,000,000 H/s.