Deletion refers to the act or process of removing, erasing, or obliterating something. In computer science and technology, deletion typically means the removal of data from a storage device such as a hard drive, memory card, or cloud storage. This can be done manually by the user or automatically through programs that run in the background to free up space on the device.
In other contexts, deletion may refer to removing something physically, such as using a sharp object to scratch out text from a document, or using chemicals to remove a tattoo. It can also mean the removal of something from a list, collection, or database - for example, deleting an email from your inbox or removing someone's name from a mailing list.
Overall, deletion is the act of getting rid of something that you no longer want or need, whether it be digital data or physical objects.