npx is a command-line interface (CLI) tool that comes with npm. It allows developers to execute any JavaScript package available on the npm registry without installing it. npm (Node Package Manager) is the default package manager for Node.js. It is used to install and manage packages and modules for Node.js. npx is pre-bundled with npm since version 5.2.0.

Here are some differences between npm and npx:

• npm is used to install and manage packages and modules for Node.js, while npx is used to execute packages without installing them.
• npm installs packages locally or globally, while npx executes packages without installing them.
• npx is useful for running packages that are not previously installed.
• npx is also useful for running locally installed packages easily.

To check if npx is installed, you can run the following command:

which npx

If its not installed, you can install it using the following command:

npm install -g npx

Once you have npx installed, you can execute a locally installed package by typing:

npx your-package

You can also execute a package that is not installed by typing:

npx package-name

Overall, npx is a useful tool for executing packages without installing them, which can save time and disk space.