A CSAT score is a performance measure of a customer’s satisfaction with an organisation and/or its products and services.
It is different to loyalty (Net Promoter Score) in the sense that it is a measurement of the here and now, and thus takes into consideration the present and past performance. Whereas loyalty is very much a future gazing measure.
CSAT scores can be used to give a measure of the overall performance of an organisation and/or its products and services, or it can be used to separately measure all the different customer touchpoints.
That said without a doubt the most famous CSAT measure of all time is that of overall satisfaction:
Overall, how satisfied are you with… on a scale of 1 to 10, where 1 is not at all satisfied and 10 is extremely satisfied?