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localhost is a special hostname that refers to your own computer. When you type localhost in your web browser, it will load the default web page or application that is running on your local machine.

Here are some common uses of localhost:

1. Web development: Many web developers use localhost to test their websites or web applications locally before deploying them to a production server.
2. Testing: localhost is often used for testing purposes, such as testing a new feature or bug fixing.
3. Development environments: Some development environments, like IDEs (Integrated Development Environments), use localhost to connect to a local server or database.
4. Local services: localhost can be used to access local services, such as a local database or a local file server.

Some common commands related to localhost include:

• localhost:8080 - Access a web server running on port 8080 on your local machine.
• localhost:5432 - Access a PostgreSQL database running on port 5432 on your local machine.
• localhost:22 - Access a SSH server running on port 22 on your local machine.

Remember that localhost is a special hostname that only resolves to your own computer, so you can't access it from another device on the same network.