What people don’t realize about tea is that white, yellow, green, oolong, black, and pu’ehr all come from the same plant: camellia sinensis.
The colours simply refer to a degree of oxidization.
White is unfermented, green is slightly oxidized, black is mostly oxidized, and pu’ehr is completely oxidized – to the point of fermentation.
Now if you want to know why black tea tastes different from Indian tea, it’s because Indian tea is a different subspecies called camellia sinensis assamica.