Evernote is a piece of software and services designed for making notes and remembering things and archiving. (Remebering things through your computer or smartphone).
I used it for making notes on our English book 'Brighton Rock'
A "note" can be a piece of text..., a full webpage or webpage excerpt, a photograph, a voice memo, or a handwritten "ink" note. (I found this particularly interesting!). Notes can also have file attachments. Notes can be sorted into folders, then tagged, annotated, edited, given comments, searched and exported as part of a notebook. In my opinion it is very clever but I don't know when I would use it.