What does hinduism means?

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It will start from the different forms of gods in the hindu epics.Why does the three main gods of hindu relics namely Brahma(the creator), vishnu( the preserver)& lord shiva (the destroyer) are given such forms & images.I want to say here one thing that whenever a painter or a writer is doing some painting or wrttting any book there is a theme or a lesson behind that so what is the reason behind giving such images for the three main gods of hindu religion? om namah shivaya.