Hi Vijay,
Thanks for asking! That’s a big question. Krishna is a sanskrit word for ‘The Supreme Personality of Godhead’, which means one who is ‘all attractive’. It means that the Supreme source from whom everything emanates has everything in full. For example, we see beauty in this world, but we understand that this beauty is coming from Krishna who is unlimitedly beautiful. Same with wealth, power, knowledge, etc. Krishna has unlimited quantities of everything and hence is the most attractive.
There’s a lot more, but hope this helps for now!