Memo pad or notepad is a block of paper with tear-off pages for writing notes on.
Small memo pads can be the size of a regular sticky note or as large as a notebook.
A Flyer is usually a single, unfolded printed sheet that is used to draw attention to an event, service, product or idea. A flyer usually contains a very simple message that can be conveyed quickly.
A Brochure can have specifications similar to a flyer, but a brochure almost always has printing on both sides. A brochure contains folds that create multiple panels or pages of information. Brochures can also be created from multiple sheets bound together. Sometimes smaller, simpler brochures are referred to as pamphlets.
A card for sending a message by mail without an envelope, typically having a photograph or other illustration on one side.
A combination of a postcard and flyer. It advertises an event, service product or idea however is usually a heavier paper stock. These are often used for unaddressed admail or front door stuffers.