Vedic Vidya comes from a time when knowledge was not written down in notebooks. Instead, it was transmitted through sound. Teachers used to share this knowledge with the students verbally for generations.
And because of it, the term "Vedangas" exists (limbs of the Veda). As the Vedic knowledge was passed down only by speaking, people needed a way to keep it correct, something similar to a guide for grammar, pronunciation and rhythm. This made sure that everyone gets this learning the exact same way.
With time, students moved from repeating this term aloud to applied study, and it was used in different areas of life, like: