Relay modules are widely used in electronics and automation projects.
They help in controlling high-voltage devices using low-voltage signals.

## What is a Relay Module?
A relay module is an electrically operated switch.
It allows a low-power signal to control a high-power circuit safely.

## How Does a Relay Module Work?
When a control signal is applied, the relay coil gets energized.
This changes the position of the switch contacts, turning devices ON or OFF.

## Types of Relay Modules
Common relay modules include:
- Single-channel relay module
- Dual-channel relay module
- 4-channel relay module

## Applications of Relay Modules
Relay modules are used in:
- Home automation systems
- Arduino projects
- Industrial control systems
- Robotics projects
- IoT applications

## Using Relay Module with Arduino
Relay modules are often connected with Arduino boards to control
lights, motors, pumps, and other electrical appliances.

## Conclusion
Relay modules are essential components for switching high-power devices safely.
They are easy to use and suitable for beginners and professionals.