Adobe Illustrator is a vector graphic editor that allows you to create beautiful illustrations and designs. However, if you want to change your background in Illustrator, there are a few things you need to know. First, you need to create a new document in Illustrator. Then, select the Background tab and click on the Change Background button. Now, enter a new background image into the text field and click on the OK button. You will now see your new background in Illustrator.