Final answer:
When you delete data, it is not truly gone because the operating system marks the space as available for reuse but the actual data is still present until it is overwritten. Specialized software can permanently delete data by overwriting it multiple times.
Step-by-step explanation:
When you delete data, it is not truly gone because of the way computers store and retrieve information. When you delete a file or data from your device, the operating system simply marks the space where the data is stored as available for reuse. The actual data is still physically present on the storage medium until it is overwritten with new data.
Think of it like erasing a whiteboard. When you erase something, the writing is no longer visible, but it is still there until you write or draw something else on top of it.
If you want to permanently delete data, you need to use specialized software that overwrites the deleted files multiple times, making it much more difficult to recover the original data.