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| Name | MOBI | PDB |
| Full name | MOBI - Mobipocket | PalmDOC eBook File |
| File extension | .mobi, .prc | .pdb |
| MIME type | application/x-mobipocket-ebook | application/vnd.palm |
| Developed by | Mobipocket SA | Palm, Inc. |
| Type of format | Ebook file format | eBook File |
| Description | Mobipocket SA is a French company incorporated in March 2000 that created the .mobi e-book file format and produces the Mobipocket Reader software for mobile phones, personal digital assistants (PDA) and desktop operating systems. | The .pdb file extension is a database format used for the Palm OS platform. The PalmDOC eBook file type is a version of the PDB format. The proliferation of eBooks has left this format behind due to the lack of support for DRM protection meaning only royalty free text is typically available. |
| Technical details | The Mobipocket e-book format is based on the Open eBook standard using XHTML and can include JavaScript and frames. It also supports native SQL queries to be used with embedded databases. The Amazon Kindle's AZW format is basically just the Mobipocket format with a slightly different serial number scheme, and .prc publications can be read directly on the Kindle. The Kindle AZW format also lacks some Mobipocket features such as JavaScript. | The format supports reflowable content however the format lacks some of the features found in more modern eBook formats, for example only providing a very basic contents table. The format features RLE compression which was crucial because the format was designed for the low storage capacity Palm devices of the 1990s. |
| Associated programs | Mobipocket Reader | ICE Book Reader, Palm Reader |
| Wiki | https://en.wikipedia.org/wiki/Mobipocket | http://en.wikipedia.org/wiki/PDB_(Palm_OS) |