$\rightarrow$ The fruit is a mature or ripened ovary, developed after fertilisation. If a fruit is formed without  fertilisation of the ovary. It is called a parthenocarpic fruit. Generally, the fruit consists of a wall or pericarp and seed. Seed is enclosed by pericarp in a fruit.
$\rightarrow$ Pericarp may be dry or fleshy. When pericarp is thick and fleshy, it is differentiated into the outer epicarp, the middle mesocarp and the inner endocarp.
$\rightarrow$ Drupe : In mango and coconut, the fruit is known as a drupe. They develop from monocarpellary superior ovaries and are one seeded.
$\rightarrow$ In mango the pericarp is well differentiated into an outer thin epicarp, middle fleshy edible mesocarp and an inner stony hard endocarp.
$\rightarrow$ In coconut which is also a drupe, the mesocarp is fibrous.