Question

what is unit and its types

Answer 1

a unit is a measure used to calculate something
there are Two types of unit they are fundamental unit and physical unit there are seven fundamental units at Length breadth with electric city ampere Newton

Answer 2

In the area of mathematical logic andcomputer science known as type theory, aunit type is a type that allows only one value (and thus can hold no information). The carrier (underlying set) associated with a unit type can be any singleton set.
There is anisomorphism between any two such sets, so it is customary to talk about the unit type and ignore the details of its value. One may also regard the unit type as the type of 0-tuples, i.e. the product of no types.The unit type is the terminal object in thecategory of types and typed functions. It should not be confused with the zero orbottom type, which allows no values and is the initial object in this category. Similarly, theBoolean is the type with two values.

The unit type is implemented in mostfunctional programming languages. The void type that is used in some imperative programming languages serves some of its functions, but because its carrier set is empty, it has some limitations. MARK it as brainleist