A subnotebook is a portable computing device that is smaller and lighter than a traditional laptop. There are several synonyms for subnotebook, including ultrabook, netbook, mini laptop, and mini notebook. Ultrabooks are typically thinner and more powerful than netbooks, which are designed for basic computing tasks. Mini laptops and mini notebooks are generally used interchangeably and refer to smaller laptops that usually have a screen size of 10 inches or less. Other popular terms include portable laptop, mini PC, and compact notebook. These various terms highlight the growing demand for lightweight and portable computing devices that are ideal for people who are always on the go.