It is a personalized email address that matches your domain name. For example if your business name is ABC PTY LTD then your email address maybe enquiries@abcptyltd.com.au Having proper company email addresses is much more professional than using the email given to you by your internet provider or using a free online email address. You can create email addresses for each member of your team. Some more examples of email addresses might be:

sales@abcptyltd.com.au
yourname@abcptyltd.com.au
contact@abcptyltd.com.au