Origin of Vedas :

The four Vedas are treated to be the revelation of omniscient God. They were given to mankind by all creating God in the primitive state of the Universe. Almighty divinity is not only creator of the universe but he is also the ultimate primal ground of knowledge. He creates the universe as an efficient cause of it and reveals the knowledge in the form of thought and language as and primeval eternal preceptor. No thought is ever thinkable without language and no language without thought. This complexity of the problem of language and thought may be solved by arriving at this convincible conviction that inward language is thought and outward thought is language. Both cannot be separated. To solve the problem of the origin of thought and speech the best way has been adopted as the theory and speech of revelation. Revelation is that force by which thought and speech are revealed by God. Thus the Vedic language though in exact expression, the Vedic knowledge is revealed by Divinity Himself. Vedic language was never a spoken language of any time and clime. It will ever remain as the same.

Where ever any possibility of uninstalling ability appears it has been removed by giving necessary notes of the words, verses and hymns concerned. Human understanding, working and perseverance suffers from certain inadequacies by nature but in spite of all that, every careful case has been taken to make the translation faithful and meaning of the verses crystal clear.

Vedas - Definition :
Vedas - Sound of Vibraions which informs the paths to the Living Being to achieve their Goal. For Example if we have to go to certain destination , We can go thru Air, Railways, Roadways. Based upon their facility, their circumstances , the man is choosing the path to reach the destination. In the Platform there comes announcement that in which platform which train is going and the routes in detail .
Just like this Vedas is a way of announcement to all the Human Beings and guiding them to reach their destination based on their Karmas.

Rig Veda - It informs What is Supreme Reality & its Chatacteristics
Yajur Veda - It informs How to Approach the Supreme Reality
Sama Veda - It informs How to Experience with the Supreme Reality
Atharva Veda - It informs How to Mingle with the Supreme Reality
These are the essence of four Vedas.

Rig Veda deals with the knowledge of substances and qualities. This knowledge may be called pure science.

Yajur Veda deals with all sorts of movements including process and performance of deliberate actions.

Sama Veda is concerned with all communion contemplation and concentration. This is purely Upasana Knada.

Atharva veda deals entirely with the Knowledge experience and intuitive.
Atharva i.e. Atha+Arvan Veda is concerned with the knowledge of wordily phenomena and noumena.