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Yes, lightning addresses are built on top of LNURL. Lightning addresses are a user-friendly way to request invoices, instead of lnurl followed by a long incomprehensible string.
Reading this should help you understand:
Paying to static internet identifiers
With LNURL Pay, developers went a step further and proposed a method of paying to an email-like address, like satoshi@voltage.com. Instead of making a request for an URL encoded in an invoice, the wallet makes a request to voltage.com/.well-known/lnurlp/satoshi. The server then responds with the same information and instructions defined in LNURL Pay request spec and the flow continues as this was just a regular LNURL Pay request. In essence, the only thing that changed is the initial URL.