A method of joining a wire to a terminal by tightly compressing the metal barrel of the terminal around the stripped wire strands. When done with the correct die and pressure, it creates a gas-tight bond that prevents corrosion and resists mechanical vibration better than soldering. It is the standard method for terminating wires in aerospace, automotive, and industrial electronics.
You need to crimp those pins with the ratcheting tool, not a pair of pliers, or they'll pull right out.
A proper crimp is stronger than the wire itself; if you can pull the wire out of the terminal, the crimp failed.
Related terms
Crimping tool
A hand tool used to deform metal connectors around stripped wire to create a secure electrical joint.
Connector
An electromechanical device used to join electrical terminations and create an electrical circuit.
Pinout
A diagram or table detailing the purpose of each electrical contact on a connector or chip.