A PDF is a kind of document that's easy to open on all sorts of platforms. It's good to use if you don't want someone else editing the document or when you don't want the look of the document to change, like when sharing your CV.
Drop a file anywhere on the page or click the button above
A JPG is a kind of picture that's often used for photos. Pictures saved as JPEGs don't take up very much space, but their smaller size is because they're a little worse quality – most of the time small details will be lost.