I am traveling from India to Australia next month. Can anyone please tell me which kind of adapter I should buy? will the product listed below help? or do I need to have a product which performs step up or step down also?
Both India and Australia use 240V, so you do not need a step up/down transformer.
However, you will need an adaptor, since the Australia/NZ "Type I" plug is not compatible with Indian plugs and is used virtually nowhere else: https://en.m.wikipedia.org/wiki/AS/NZS_3112
Adaptors are widely available in Australia, including supermarkets and convenience stores, but hard to find outside Australia. However, some fancier multi-plug adapters have rotating pins so they work in Australia as well.