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a door that is located behind or at the side of a building
What is a "back door"?
A back door is an entrance to a building that is typically located at the rear, as opposed to the front entrance. It is often used as a secondary entry point for convenience and may provide access to areas such as a backyard, garage, or service entrance. Back doors can vary in design and functionality, ranging from simple doorways to more elaborate styles with features like windows or security locks. They serve practical purposes, such as allowing easy access for deliveries, outdoor activities, or maintenance, while also contributing to the overall layout and flow of a home.
a secret or underhand means of access (to a place or a position)
an undocumented way to get access to a computer system or the data it contains
