A leaflet is a small printed sheet that is usually folded and is intended for free distribution. It is often used to disseminate information or to promote a product or service. Leaflets can be made from a single sheet of paper, sometimes folded, and are usually made from cheaper, lower-quality paper than pamphlets. They can be handed out personally, delivered to a customer’s mailbox, or stapled to a certain product upon purchase.

There are different types of leaflets, including conference leaflets, business leaflets, promotional leaflets, and education leaflets. Leaflets are also used in web mapping applications, as Leaflet is an open-source JavaScript library used to build web mapping applications). It supports most mobile and desktop platforms, and among its users are FourSquare, Pinterest, and Flickr).

Leaflets are different from pamphlets in that they are smaller and usually contain less information. They are also different from compound leaves, which are the subdivisions of a compound leaf such as a fern leaf.