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Sliding doors function by moving horizontally on a track as opposed to swinging open or closed like conventional hinged doors do. It is made to be space-efficient and to make getting to the outside or between rooms simple.
Two or more panels make up sliding doors, one of which is fixed in place while the other(s) slides horizontally to open or close the door. Usually, tracks or rollers placed at the top or bottom of the door frame provide the sliding mechanism.
 
There are different types of sliding doors available, including:

1. Patio Sliding Doors: These are commonly used as entrances to outdoor spaces such as patios, decks, or gardens. They are usually made of glass panels to allow natural light into the interior and provide a view of the surrounding area.

2. Interior Sliding Doors: These are used within a building or home to separate rooms or create flexible spaces. They can be made of various materials, including wood, glass, or even metal, depending on the desired aesthetic and level of privacy.

Sliding doors have many benefits. Since they don't need room to swing open, they take up less space than swinging doors. They also offer a smooth transition between interior and outdoor areas, facilitating quick access and enhancing one's sense of immersion in the environment. Sliding doors can also improve the amount of natural light that enters a space, giving it a feeling of more openness and space.
Sliding doors are a common option due to their practicality, attractive appearance, and space-saving layout.