The efficiency of a crypto mining machine, measured in terms of the speed required to compute new hashes.
Hash rate refers to the average speed it takes a computer to correctly compute new hashes for the blockchain. This rate is measured in hashes per second (h/s) and represents how sophisticated the mining machine is. Thus, miners take note of this frequency when deciding on appropriate crypto computing hardware or software since it can be the underlying reason behind their successful mining endeavor.
Hash rate varies from blockchain to blockchain and generally depends on the difficulty involved in mining new blocks.