laptop computer market continues to expand

Since the introduction of portable computers during late 1970s, their form has changed significantly, spawning a variety of visually and technologically differing subclasses. Except where there is a distinct legal trademark around a term (notably Ultrabook), there are rarely hard distinctions between these classes and their usage has varied over time and between different sources. Despite these setbacks, the laptop computer market continues to expand, introducing a number of laptops like Acer's Aspire and TravelMate, Asus' Transformer Book, VivoBook and Zenbook, Dell's Inspiron, Latitude and XPS, HP's EliteBook, Envy, Pavilion and ProBook, Lenovo's IdeaPad and ThinkPad and Toshiba's Port g , Satellite and Tecra that incorporate the use of laptop computers