By means of a relay, a circuit with much more power can be switched with a relatively small current.
Customer reviews about Relay modules
Raffie12V 10A relayGreat product! Soldered and everything works again!
GuidoRelay module 5VThe product meets expectations and the description on the website. It was delivered very quickly!
DennisSparkFun Qwiic Single RelayHandy module for switching via microcontrollers. Easy to connect with the Qwiic system, without soldering. Works fine via I2C and is reliable under high load.
Willem12v module relayWorks perfect, the scheme/manual is missing
FloRelay module 5VWorks perfectly. I use it to trigger a plasma cutter from a Creality Falcon 10w engraver. Requires adding a 5V power supply ( USB in my case) to avoid IO collapse