Wikipedia describe a version control tool as something that
… tracks and provides control over changes to source code.
It does more than that (like allow collaboration), but that’s a very good description.1,135 more words
Sometimes when we plot data we want to indicate a relevant feature or have a user select a section of the data. For example, if we record electromyography (EMG) and force signals, we might want to have the user mark the baseline EMG level so that it can be removed, and determine the amount of EMG produced during a maximum voluntary contraction (MVC). 1,097 more words