A VAR is an organization that resells POS equipment or software and adds some value to the sale, either in training, support, integration services, etc. Generally, it is a loose term for the distribution channel for POS specific hardware and some general purpose POS software.

A system integrator that offers clients a suite of products and services including consultation, systems integration and training in order to deliver end-to-end solutions.

A VAR is someone who adds some type of value like software to new or refurbished hardware products and sells to an end user, however they do not as a primary business buy and sell refurbished hardware.