Om Om Om
Vedas are the ancient Indian scriptures. The root vid means knowledge; so, any scriptures that talk about the truth are Vedas. For example, the Bhagavad Gita, Song of God, forms part of the epic poem of the Mahabharata and belongs to the culture of ancient India and is a Veda.. Vedas can also be refereed to as shruti- that which is heard; but not heard from another person or read from text, or had been written by someone, "heard" by sages through the process of deep mediation. And, that is why, the content of these shrutis is called the Eternal Truth or Sanatana Dharma.
Such truth has no limitation because such truth is cosmic. This truth has been revealed or realized (heard) in the very core of every religion. It may be expressed a little differently according to the age, culture, geographical location but all those who go into a properly receptive state can get the same vision and that is why such truth does not pertain just to India as truth has no limitation. Each religion also has its veda. Torah is a veda. Bible is a veda. Dhammapada is a veda. Koran is also a veda. The Bhagavad Gita is a veda. Every revelation of the same cosmic truth is a veda.
The revelations were passed from teacher to student by word of mouth, they were unwritten, and for that reason the shrutis are called Elutha Marai. As time went on, it was difficult to retain the scriptures by heart, and that is why students began noting down the scriptures and that is how the Vedas came to be written. The Vedas do not only talk about spiritual knowledge, they cover the entire universe and all its activities. They include the day-to-day side, how a marriage should be conducted, how rituals to be performed, and of course the plain truth or wisdom- Vedanta.
The Vedanta portion of the Vedas talks about the goal or the end of the Vedas; Anta means end. This portion refers directly to the final spiritual truth. Vedanta portion of the Vedas is also known as Upanishads. The great sage Vyasa is to whom the entire Vedas are ascribed and he simplified the teachings in his Brahma Sutras, teachings about the Absolute. The sutras, threads, became further diluted to make it a little easier for people to understand the teachings.
The Bhagavad Gita is a way to explain the high philosophy teachings. But if we want to learn from great scripture, we must approach it with respect and place ourselves in a receptive state- and probably understand the commentary :-)!!!
Om Om Om