Is Blockchain a single linked list

Question

When seen as a datatype, is Blockchain a single linked list? As each block refers to the previous block using a hash or is it some kind of tree?

Answer 1

Basically, Blockchain is represented as a single linked list where each block has a hash of the previous block which can be thought of as a pointer to previous block. Some differences are that in a linked list, there are additional operations that are not available in a blockchain, most notably being able to remove a block and to add a block in the middle of the list/chain.