The resemblance is a modern sports car and a steam engine, but cars would never exist without the first drivers. The same thing happened with notebooks, or do you think they were born with desktop-friendly wireless connections and hardware? The storybook to tell the origin of laptops.
There is a small distinction between laptop and notebook, the notebook being about the same size as a university notebook and necessarily smaller than the laptop. Despite this, there is no official convention on nomenclature, and in modern parlance, the use of the two names is done randomly, with small portable computers with fewer resources being occasionally called laptops