An IC (Integrated Circuit) socket allows you to insert and remove chips easily from an assembled kit or project
This item contains 3 of the 20 pin 0.3" wide version. Best used with chips that have 20 pins (2x10) and have 0.3" pin spacing.
These are often used for soldering into a Perma Proto or PCB so that you can replace and swap chips easily. What's nice about IC sockets is that they are the same pin spacing and size so you don't have to redesign the board!