A servo is a mechanical system that rotates from 0 to 180 degrees. To help you understand the power of the servo mechanism, let's have a look at a common servo and where and how can we use it.
The preceding image is of a simple servo. Usually, a servo consists of two or three different plastic modules that we can easily change according to our goal. The servo is connected with 5V to any device like an Arduino board or most of the flight controllers that support a servo.
You have to identify the servo you bought and connect the wires in the right order according to the preceding image.
One or two servos can be used to create a simple DIY grabber at the bottom of the craft. A servo goes from 0 to 180 degrees, so it's quite simple to create a mechanism similar to this. Furthermore, we can use it to trigger various dropping mechanisms.