nginx root alais

Nginx allows you to define root and alias directives in its configuration to handle file serving.

The `root` directive is used to specify the root directory for a location block. It sets the base directory against which location directives are evaluated. For example:

server {
    ...
    root /var/www/html;
    ...
}

In this case, requests to this server block will be served from the `/var/www/html` directory.

On the other hand, the `alias` directive is used to define a location that is different from the document root directory. It is commonly used when you want to serve files from a specific directory but want to hide the actual path. For example:

server {
    ...
    location /images/ {
        alias /var/www/images/;
    }
    ...
}

In this case, requests to `/images/` will be served from the `/var/www/images/` directory, but the URL will not expose the actual directory structure.

Both `root` and `alias` can be useful for serving static files or handling different file serving requirements in Nginx.