Hello, tell me what started your interest in chicken? 
Chicken is a domesticated fowl
What is a domesticated fowl?
A subspecies of the red jungle fowl. Human keep it as a source of food
great! Are there different subspecies of chicken?
Yes there are. Chicken is gallus gallus
Ok, nice! Why do humans use it a food source? 
The chicken is easy to domesticate. 
Is it expensive to maintain domesticated chicken?
Yes it is expensive to domesticate chicken.