The noun 'fruit' as a word for a food substance is an uncountable noun.
The plural form 'fruits' is used exclusively for 'types of' or 'kinds of'; for example:
The fruits needed for this recipe are cherries and blueberries.
Transport is both countable and uncountable as a noun.
The noun 'steel' is an uncountable (mass) noun, a word for a substance.
Shark is a countable noun.
countable
Countable
The noun 'daytime' is an uncountable noun.
The noun 'animal' is a countable noun. The plural form is animals.
Prawn - prawns is the plural - is a countable noun
The word 'violence' is an uncountable noun.
Pasta is a countable noun
Countable
The word "apple" is a countable noun because it refers to individual fruits that can be counted (e.g., one apple, two apples). In contrast, "apple" as a concept or in a broader context (like representing the fruit in a general sense) can be considered uncountable, but typically, when referring to the fruit itself, it is countable.