Question

Write difference between the Upanishads and the Vedic religion.​

Answer 1

Vedas contain hymns that are the songs of joy of the Siddha, the Accomplished, who already had the realization (sākṣātkāra) of the ultimate truth (tattva).

Whereas the Upaniṣad is the textbook for the Sādhaka, the Path-finder, the one who is striving to become accomplished.

This is why we see the Upanishads quote the Vedic mantras to fortify their conclusions, because the Upanishad rishis knew that the older Vedic rishis had the same vision and enlightenment.