Why is soap alkaline in nature?

Soap is alkaline in nature because it is made by mixing a strong alkali (such as sodium hydroxide or potassium hydroxide) with fats or oils in a process called saponification. The alkali reacts with the fats or oils to form soap molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) properties that make them effective for cleaning.