iMac is a desktop computer made by Apple known for its slim design and powerful graphics. However, data can be lost from an iMac through issues like viruses, accidental deletion, or formatting. To recover lost data, professional iMac recovery software can be used which features rapid scanning, supports recovery of different file types, and allows recovery of data from storage devices like iPods or cameras connected to the iMac. The recovery process involves launching the software, selecting the iMac volume, scanning for lost files, and restoring them to a specified location.