Backrests are an essential part of any seating arrangement, providing support and comfort to the user. There are several synonyms for the word backrests that can be used interchangeably in different contexts. These include back support, lumbar support, spine support, and chair back. Back supports can be found in various shapes and sizes, from small cushions to full-length pillows, and can be made from a range of materials, including foam, memory foam, and gel. Lumbar support tends to be more focused on the lower back, while spine support can be used to refer to the entire length of the backrest. Chair back is a broad term that can be used to describe any type of backrest on a chair.