Title tag, 15–65 characters The blue headline in Google results and the text in the browser tab.
Structured data (JSON-LD or microdata) Machine-readable facts - address, phone, hours. This is what puts a business in a map card instead of a plain link.
llms.txt or AGENTS.md for AI search Plain text files that tell ChatGPT and Perplexity what your business does. Almost nobody in Austin has one yet.