Orbitrage by definition is a financial transaction that 
makes an immediate profit without involving any risk. 
Technically it consists of purchasing a commodity or 
security in one market for immediate sale in another market

simultaneous purchase and sale of...

guys its arbitrage not orbitrage as far as i know

Arbitrage is a person who makes an profit without taking 
risk. Where he purchase a security in one market for a 
lower price and sells in other market at a higher price to 
make profit.

arbitrge is a process in which we divercify our risk 
associated the securities through investing in various 
securities

in simple terms arbitrage is nothing but the usage of
securities risk freely in different markets to earn profits.
for e.g, buying of some shares in the market where the price
is low and selling in the market where there is a higher price.