Why does the definite article "o" sometimes come before the "que"?

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دُرُوس ذَاتُ صِلَةِ

فِيدْيُوهَات ذاتُ صِلَة

What are the isolated form of Arabic letters used for?
AHMED MOHY EL DIN ALI
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الغة الانجليزية العِبْرِيَةُ العربية