A wall calendar is a calendar

Calendar

A calendar is a system of organizing days for social, religious, commercial, or administrative purposes. This is done by giving names to periods of time, typically days, weeks, months, and years. The name given to each day is known as a date. Periods in a calendar are usually, though not...

 intended for placement on a wall. Wall calendars can serve as reminders of holiday

Holiday

A Holiday is a day designated as having special significance for which individuals, a government, or a religious group have deemed that observance is warranted. It is generally an official or unofficial observance of religious, national, or cultural significance, often accompanied by celebrations...

s, important events, and company events. They typically consist of a collection of images (one per month) on a given subject.

Example subjects include automobiles, wildlife, male or female models, etc. Sizes of wall calendars vary, with 12 inches by 12 inches (305 mm by 305 mm)(closed) being a typical size within the United States.

Businesses frequently give wall calendars away for free to customers as promotional merchandise

Promotional merchandise

Promotional merchandise, promotional items, promotional products, promotional gifts, or advertising gifts, sometimes nicknamed swag or schwag, are articles of merchandise used in marketing and communication programs. They are given away to promote a company, corporate image, brand, or event...

.