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Domain authority is a score that SEO software companies calculate to estimate how strong a website's link profile is compared with other sites. It is a third-party estimate, not a Google metric, and each tool calculates its own version in its own way.
In short
Because each tool uses its own method, the same site gets different scores in different tools, and the number is only useful for comparing sites within one tool. A new local business with a low score can still rank for local searches. The score does not measure whether a page is helpful or relevant to a search.
Treat it as a rough comparison of link strength between competitors, not a goal. Do not buy links or join link schemes to lift a score, which Google treats as link spam. Focus on pages that help readers and on earning mentions from real businesses and publications in your area.
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