To install MongoDB on a Mac, follow these steps:

Open the Terminal app on your Mac. You can find it in the Applications/Utilities folder or by searching for “Terminal” in Spotlight.

Use the following command to install Homebrew, a package manager for macOS:

/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"

Once Homebrew is installed, use the following command to install MongoDB:

brew install mongodb-community

After the installation is complete, create a directory for MongoDB to store its data:

sudo mkdir -p /data/db

Change the permissions of the directory to allow access:

sudo chown -R `id -un` /data/db

Start the MongoDB server by running the following command in your terminal:

mongod

MongoDB should now be running on your machine. You can connect to it using the MongoDB shell by running the following command in a new terminal window:

mongo

That’s it! You now have MongoDB installed and running on your Mac.