After I type a character does it have it's own digital identity?

When I type (a) for instance. That letter now exists in a particular place being held together by the memory of my computer which is acting in a text program within my browser (if I understand correctly). Now I have gone back and erased that (a) above ten times, and replaced it each time with the exact same letter.

Was this happening every instant that the (a) sat on the screen anyway? Is that (a) a particular set of 1’s and 0’s? What is its permanence like?

Say I typed it in a word document, and then saved it. When I reload the document on a later date is it the same (a) or is there something new about it? I am not sure how to ask this question…maybe you can help.