Closed-loop systems are able to correct in order to meet target results. Normally a sensor is used to look at the output and adjust the process accordingly. This is called feedback.
A file with an extension of .DAT is known as a Data (General). These .DAT files can be opened on Windows and Apple using programs ...
Definition: Dat is basically the teenage version of that except it is hip and fresh like the teens that use it! Used in a sentence: Dat boy is so cute in his prom tux. I want a piece of dat.