The transition from outdoors to indoors can be very jarring if a visitor walks straight through a door and directly into a living room or front parlor. An architectural design element called a foyer often helps visitors orient themselves before moving into a specific room of the home. A typical foyer is a small hallway or open space just behind the main entrance which acts as a reception area for guests. Other ground floor rooms may connect with the foyer, as well as a staircase leading to an upper floor.

A foyer also serves as an initial introduction to the home's overall design scheme. An open foyer's walls may feature framed paintings or other fine art objects. It may also be sparsely furnished with decorative tables, coat racks, an oversized room clock or framed mirrors. The foyer may be lit with several floor lamps or a dramatic overhead light fixture.

The foyer of a home may also be considered a transitional space, much like a mud room or anteroom. Coats, boots and umbrellas are often kept in the foyer for convenient access during inclement weather. Guests may remove their shoes and leave them in the foyer during visits. Some foyer designs include a small but functional half-bathroom which allow guests to freshen up before entering the rest of the home.

The word foyer itself comes from the Latin focarium, meaning "of the hearth". This same Latin root can be found in the word focus, which suggests a foyer should be considered the focal point of the modern home, much like centralized fireplaces or hearths became the focus of ancient homes. A home's foyer provides visitors the opportunity to orient themselves before moving on to other rooms of interest.

The communal area outside of an auditorium or theater can also be called a foyer, although it may serve a different function than a home foyer. A theatrical foyer often contains a concession area, a front office, a ticket booth and public restrooms. A public foyer in a professional building may also contain a reception area and access to elevators and stairwells.

For those who are looking to improve the look or functionality of a home foyer, there are a number of home improvement books and websites which suggest ways to create more visual interest or improve the lighting scheme of this often overlooked area of the home.