When you are writing in a “freewrite” style of writing, using the types of prompts suggested in The Write Spot Blog, you can use your personal experiences for your writing. Or you can write about something that happened to someone else. Or you can write fiction. If you are writing fiction, respond to the prompt the way your fictional character would respond.
Freewrites are also referred to as free flow writing, free association, writing freely and I’m sure there are more descriptions for this type of writing.
Writing prompts are also referred to as: sparks, jumping-off points and, again, I’m sure there are more references to writing prompts.
Whatever you call this form of writing and whatever sparks your imagination . . . Just write.