This is the elephant in the room, which they demonstrate, coincidence or not, by having an elephant as their logo.
Evernote was founded by Stepan Pachikov in 2002.
It has its origin in Windows software and is built around the concept of notebooks, so you separate your notes depending on the field of life they are in.
A note consists of a title and text and various meta-data. If you want to store a web page you need to use the Evernote Web Clipper, through which you can (clumsily, if you ask me) take certain parts of the current page and store it to Evernote.
A big focus of Evernote has become the upload of files, partly because this is where they earn their money: as a user you have a certain amount of “upload capacity” (free users 60MB, premium users 1GB). They encourage you to store photos (for example of food) or upload PDFs. If you do so this will quickly push you close to the upload limit which in return will make you consider the premium plan.
The Evernote Web Clipper also goes in these steps. Every image in the page is also uploaded to your account, adding to your monthly volume.
The size of the Evernote imperium is clearly visible when you look at the amounts of apps they have: Evernote, Evernote Food, Evernote Hello, Evernote Peek, Evernote Clearly, Skitch, Penultimate. For a newbie it is very hard to decide where to start.
Recently Evernote has been in unfortunate news with a hack of their user database which lead them to make all users of Evernote change their password.