Is My Domain Required to Use Lightning Components in Salesforce?

Is My Domain Required to Use Lightning Components in Salesforce?

YES

Reason:

To use Lightning Components, your organization needs to have a custom domain configured using My Domain.

So what the heck is a custom domain, and why do you need to have one to use Lightning Components? First of all, a custom domain is a way to have your very own Salesforce server…sort of. It’s a way for you to use Salesforce from your own, customized URL, rather than a generic Salesforce instance URL. That is, once you have a custom domain, you’ll use Salesforce at https://yourDomain.my.salesforce.com/, which is reserved exclusively for your org’s use. Let other folks continue to use and share https://na30.salesforce.com/. Your custom domain puts you on your own private Internet island.

Setting up a custom domain has a lot of benefits besides just getting you a cool URL. Among other things, a custom domain lets you:

• Highlight your business identity with your unique domain URL
• Brand your login screen and customize right-frame content
• Block or redirect page requests that don’t use the new domain name
• Work in multiple Salesforce orgs at the same time
• Set custom login policy to determine how users are authenticated
• Let users log in using a social account, like Google and Facebook, from the login page
• Allow users to log in once to access external services

Reference:

https://trailhead.salesforce.com/modules/lex_dev_lc_basics/units/lex_dev_lc_basics_prereqs