It includes a large number of comic works, comic characters, publication information, as well as various encyclopedia entries related to comics.
Comic and Comic Character Database
Click the "Visit Site" button on this page to open the official Comic Vine website, then follow its on-screen instructions.
Comic Vine is accessed online through your browser, so there is usually no local installation. Refer to its official site for details.
You can browse comparable reading sites under the e-books category on this site and pick the one that fits you.