- Brahma, Vishnu and Mahesa constitute the trinity of Hinduism. Brahma is the creator, Vishnu is the preserver and Siva is the destroyer.

- In the Vedas we do not find any reference to the concept of Trinity.

- The gods of Trinity are not different gods, but manifestations of the same Supreme Iswara, who is also known as the Saguna Brahman or the awakened or dynamic Brahman

- To summarize the idea briefly let us take the analogy of a person performing different tasks.

- It is difficult for us to understand them, because we can understand reality in terms of comparisons, with reference to one another, not by the thing itself and because we can concentrate our attention upon only one thing at any given point of time, while our minds cannot hold two thoughts at a time.

http://www.hinduwebsite.com/hinduism/hindutrinity.asp