Arduino Female Stackable Header 4-fold

This Arduino stackable header 4-fold is suitable for DIY or for connecting a shield.
This header has 4 connection points

If you even want to build a shield then you need your shield headers to connect your shield to your Arduino board
This header is 1 of the headers you need, in addition to these headers, there are also the 6-fold headers, the 8-fold headers and the 10-fold headers.

If you have connected a shield to your arduino board and that shield has a connector such as a screw clamp, so that there is too much space so that the connection pins do not appear in that shield, you can use these headers as a coupling piece.

Also take a look at the other variants of the Arduino Stackable header.