There are several reasons why people might erase when typing, including:

1. Making a mistake: This is probably the most common reason. People make mistakes when typing, whether it’s typing the wrong letter or misspelling a word, and they need to erase or delete the mistake before continuing.
2. Changing their mind: Sometimes people change their mind about what they want to say or how they want to say it, and need to erase what they’ve typed to start over.
3. Correcting formatting: When typing, it’s common to make formatting mistakes, such as indenting too far or not far enough, or forgetting to bold or italicize text. Erasing allows people to correct these mistakes.
4. Editing: When editing a document, it’s common to erase or delete text to improve the flow or clarity of the writing.
5. Removing sensitive information: In some cases, people may need to erase or delete information from a document to protect sensitive or confidential information.
6. Starting fresh: Finally, sometimes people just need a fresh start. They may erase everything they’ve typed so far to start over with a new idea or approach.