A measure of how much data can or is sent over a specific network connection in a given amount of time, often measured in MBs (megabits per second) of available capacity, or MBs or GBs of data transfer needed to complete an operation.
There are two basic units that are built by a blockchain protocol: a block and a ledger. A block contains the data for validated transactions..
A blockchain is an electronic data structure made up of blocks (containing groups of transactions or data) which are appended sequentially.
Byzantine Fault Tolerance (BFT) is a commonly used term to discuss the security of a network.