Meaning of the word "(as) clear as day" in English

What does "(as) clear as day" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

(as) clear as day

US /əz klɪr əz deɪ/
UK /əz klɪər əz deɪ/
"(as) clear as day" picture

Idiom

very clear and easy to understand or see

Example:
The instructions were as clear as day, so I had no trouble assembling the furniture.
I remember that moment as clear as day, even though it happened years ago.