A cryptographic hash function is an algorithm that can be run on data such as an individual file or a password to produce a value called a checksum. The main use of a cryptographic hash function is to verify the authenticity of a piece of data. Two files can be assumed to be identical only if the checksums generated from each file, using the same cryptographic hash function, are identical.https://www.lifewire.com/cryptographic-hash-function-2625832
This quote from the lifewire article describes it quite well. We recommend you read the article in full to fully understand the use cases of cryptographic hashes and why a system like Logware that can store them in bulk on a blockchain has value.