I am new to web design and going to school. My teacher asked me what the differences are in using a GUI or coding in XHTML. I don't have access to any GUI applications at this time. Can anyone help me?

Well whether you're using a GUI or not you're writing HTML. And GUI is a very broad term, I'm pretty sure your teacher meant WYSIWYG. Go google WYSIWYG and you'll have your answer. Future note: use Google before asking your homework questions here

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