What is the difference between relative and non relative clause ?pleas

1.	What is the difference between relative and non relative clause ?please explain clearly
Answer» <html><body><p></p><p>A <a href="https://interviewquestions.tuteehub.com/tag/defining-2052307" style="font-weight:bold;" target="_blank" title="Click to know more about DEFINING">DEFINING</a> relative clause identifies who or what we are <a href="https://interviewquestions.tuteehub.com/tag/speaking-1220118" style="font-weight:bold;" target="_blank" title="Click to know more about SPEAKING">SPEAKING</a> about, whereas a non-defining relative clause just gives us more information about who or what we are speaking about. A defining relative clause is <a href="https://interviewquestions.tuteehub.com/tag/essential-975317" style="font-weight:bold;" target="_blank" title="Click to know more about ESSENTIAL">ESSENTIAL</a> in a sentence because we need it in order to <a href="https://interviewquestions.tuteehub.com/tag/know-534065" style="font-weight:bold;" target="_blank" title="Click to know more about KNOW">KNOW</a> who or what someone is <a href="https://interviewquestions.tuteehub.com/tag/describing-2572980" style="font-weight:bold;" target="_blank" title="Click to know more about DESCRIBING">DESCRIBING</a>.</p></body></html>

What is the difference between relative and non relative clause ?please explain clearly