How do you travel the world without alot of money?

My main passion in life has been exploration of the planet. I do not want to spend alot of money while traveling. What are some effective ways of traveling the world without spending *ALOT* of money?? Hostels?? Trekking??? Any other suggestions?? E.G Traveling from Canada, to South America. Or traveling to Europe to Asia?

Hostels yes...
bike travel with a tent..yes..
better yet..
try approaching mountain bike companies, or sailboat manufacturers, or any company you can think of that would PAY YOU to test their product while traveling with it.
Even camera companies might go for this.

Really Thank you for that information it has helped alot!