.at is the top-level domain for what country?

The top-level domain for Austria is ".at" because it is the two-letter country code designated for Austria according to the International Organization for Standardization (ISO). Top-level domains are used to categorize websites based on their geographical location or purpose, and in this case, ".at" is specifically assigned to represent Austria. This domain allows businesses, organizations, and individuals based in Austria to have a unique and identifiable online presence.