Homa or Homam or Havan is offering of intensive Pujas (poojas) to different gods and goddess performed for a particular deity by invoking the divine power of that particular deity through Agni , the God of fire.  Homam is an aged hindu custom performed to summon Agni, the god of flame, by offering Ghee (elucidated spread) and other conciliatory offerings. 

Benefit of Performing Homam

To Remove scarcity of money
To bring Success, Abundance, peace, prosperity in life
To remove blockage on the path of your success
To Bring Financial stability 
For protection from evil forces, Black Magic and Miseries
For getting progeny (own child)
For better education and Result.