This is the 754th most frequent Czech word.
nejvíc
"Nejvíc" means "the most" in English.
Here, "nejvíc" is used to imply the superlative degree of liking, indicating an extreme preference.
Mé oblíbené zvíře je pes, protože jej mám nejvíc rád.
My favorite animal is a dog because I like it the most.
In this sentence, "nejvíc" specifies the superiority of one option within a group in terms of taste preference.
Ze všech dortů mi nejvíc chutná čokoládový.
Of all cakes, I like the chocolate one the most.
Here, "nejvíc" is utilized to quantify the maximum amount achieved in comparison to others.