![](https://musicrising.tulane.edu/wp-content/uploads/sites/383/2018/05/cornet-diagram-1500-1341864728-640x360.jpeg)
Image Credit: http://www.sheehans.com
Image Credit: http://www.sheehans.com
The cornet is a brass instrument very similar to the trumpet, distinguished by its conical bore, compact shape, and mellower tone quality. The most common cornet is a transposing instrument in B♭. It is not related to the renaissance and early baroque cornett.
Source: Wikipedia