Comparative Clauses: As … as

Comparisons with adjectives and adverbs are used to compare things, people or actions, expressing the equalities or inequalities between them.

The comparative of equality (as…as clause) is used for the same purpose.

{see Comparisons with Adjectives and Adverbs, A1 level}

https://open.books4languages.com/english-a2-grammar/chapter/comparatives-clauses-as-as/