Generally competition is done in order to increase the strength, wealth or may be personal gains and it may be among companies, enterprises, industries or individual. The reason for this varies from creed to selfishness.
Competition happens by the firms in the same segment/field, same industry, and same market offering similar products and targeting the same customers to gain and sustain competitive advantages.
Success of the Competition is depends on:
Firms competitive actions
Anticipations of competitors strategy
Action Plan against competitors strategy
Should concern with resources
Should affect the rivals strategies and approaches