My Domain

With this, represent the company’s brand with a customer-specific subdomain name in your Salesforce org URLs.

You can include your company name in your URLs, for example, https://abcxyzcompany.my.salesforce.com. 

Reference - https://help.salesforce.com/s/articleView?id=sf.domain_name_overview.htm&type=5

Visual - https://www.youtube.com/watch?v=dqm9sJlAmWE