I am newbie at bitcoin and always i saw a change in bitcoin value. What are the factors that affects the change in bitcoin value? Is it also same like real money? Like if value of Gold decreases then value of US dollar increases and vice versa.

Increasing and decreasing price of bitcoin daily it is because of speculation the traders for making money from trading,
But for factors increasing and decreasing price bitcoin for long time everything depend on the developers who make updating, comunity and investors who put the money in bitcoins. (Fundamental of bitcoins)
Not all of same with real money but there are impact on price of bitcoin, bitcoin is like stock without dividen and be gained is like gold by mining.