It typically has a rectangular shape with armrests on both sides and a backrest that is either straight or slightly curved. 

Standard sofas are available in a variety of materials, including leather, fabric, and microfiber. The frame of the sofa is usually made of hardwood, which is known for its durability and strength. 

A sectional sofa is a type of sofa that is made up of multiple sections or pieces, which can be arranged in various configurations to fit different spaces or seating arrangements. Sectional sofas are often used in larger rooms .

Sofa arms can vary in size, shape, and style, and may be straight or curved, narrow or wide . Contemporary sofas typically feature clean lines, simple forms, and minimal ornamentation, and may be upholstered in a range of materials, such as leather, fabric, or microfiber. 

A sofa cum bed, also known as a sleeper sofa or a convertible sofa, is a type of sofa that can be transformed into a bed. Some sofa cum beds may also include a separate mattress or a pull-out bed frame that can be extended from within the sofa. 

Sofa cum beds are a popular choice for smaller living spaces or guest rooms, where they can serve as both seating and sleeping options. 

Fabric sofas can be a good choice for those who prefer a softer, cozier feel, and they can work well in a variety of decor styles, from traditional to contemporary. Fabric sofas can also be more affordable than leather sofas and can be easier to maintain, as they are typically more stain-resistant and easier to clean. 

Wooden sofas are often favored for their durability and natural beauty, and they can be a good choice for those who appreciate the warmth and texture of wood in their decor. 

An L-shaped sofa is a type of sofa that is designed in the shape of the letter L, with two sections that are perpendicular to each other. L-shaped sofas typically have one section that is longer than the other.

A Chesterfield sofa is a type of sofa that is characterized by its distinctive button-tufted, quilted leather upholstery and its rolled arms that are the same height as the back. They can also be upholstered with other materials, such as velvet or linen. 

Leather sofas are often favored for their durability, natural beauty, and the way they can age and develop a patina over time 

A lounge sofa is a type of sofa that is designed for lounging and relaxing. They can be a good choice for those who enjoy reading, watching TV, or just hanging out and unwinding at home. Lounge sofas can come in a variety of styles.

A loveseat sofa, often called simply a loveseat, is a type of sofa designed for seating two people. Loveseats are typically smaller than a standard sofa, and they can be found in a range of styles and materials.