How To Use A Palm As Tablet Is There A Digital Notebook? What Are Good Ones?

Is there a digital notebook? what are good ones? - how to use a palm as tablet

Is there such thing as something like a palm tree, but it is to act like a digital notebook where you write and draw something on the screen and how you can save it, no matter how many pages you can go back? just like a laptop? Ive seen the tablets or pills cyber but require the use of pen and special paper with special ink .. and you can not return everything, what you have written, unless you first connect to a PC .. Is there such a product that works like a laptop? I hope the hand of the size .. Thank you.