What is Pinacol-Pinacolon reaction?

The pinacol?pinacolone rearrangement is a method for converting a 1,2-diol to a carbonyl compound in organic chemistry. The 1,2-rearrangement takes place under acidic conditions. The name of the rearrangement reaction comes from the rearrangement of pinacol to pinacolone.

https://en.m.wikipedia.org/wiki/Pinacol_rearrangement