Compounds responsible for the pleasant, fruity scents of fruits and many perfumes belong to the class of organic compounds known as esters(alkanoates). Low-molecular-weight esters are responsible for the odours in fruits (e.g., isoamyl acetate in bananas, ethyl butyrate in pineapples).

Due to their, sweet-smelling, and often fruity nature, they are used extensively in synthetic flavours, perfumes, and cosmetics.

While other compounds like aldehydes and ketones can contribute to odours, esters are the primary class associated with these specific pleasant fruit-like aromas.