Again — people tend to talk about Blockchain as a combination of the data structure and some sort of consensus algorithm but the term only properly refers to the data structure.

The only difference between it and a git history is that git histories are dags instead of trees — The hash-of-parent-node structure is the exact same, except commits can have multiple parents. The tamper resistance of the data structure itself comes from the hashes: it serves as both a pointer and a checksum for the previous nodes.