| Word | Description |
| jDownloader | jDownloader is an open source download manager, written in Java, which allows the download of files and split files from one-click hosting sites such as Rapidshare and Megaupload automatically. The user specified download links are split into packages to enable individual pausing and continuing of downloads. Split RAR-Archives are unpacked automatically after download. |
| JPEG | JPEG is a commonly used method of compression for photographic images. The degree of compression can be adjusted, allowing a selectable tradeoff between storage size and image quality. JPEG typically achieves 10:1 compression with little perceptible loss in image quality. |