The world is full of competition.
It is seen in almost every facet of life. In buisinesses, productions, computing, creativity, to name a few.
1. Because of competition we have not one but four major telecommunication networks in nigeria. (mtn, glo, etisalat and airtel). Imagine it was only mtn we had. They will make calls if possible 1naira per second and u have no option. I remember d time when mtn was 250mb for 1000naira. But glo and other networks spoilt their high price tags. Now dey all are competing to win more customers by making things relatively cheaper.

2. If there was no competition, by now android phones will b phones meant for only the rich.
Tecno entered d competition and made things cheaper forcing other manufacturers to reduce price to some extent.

3. Computing: due to competition, there are several manufacturers of computer systems worldwide.
Hp, dell, vio, toshiba, apple, acer, etc. All competing to come out with d best product and gain more customers.
Today we have so many softwares used to do just one particular task. Is a mattter of choosing your preference. I was browsing through d internet today to find out abt d best software for learning how to type. In D top ten 2016 software ranking, d popular mavis beacon we use here is not even among d top 3.
There are thousands of programming languages in existence today. All as a result of competition.

4. Gaming: lets go back to back through d history of gaming consoles. From mario to sega, to playstation1, 2, 3, and d latest, playstation 4. Microsoft's xbox also. These gaming console makers are competing to achieve d best in terms of capability , graphics, and d likes.

5. Politics: in nigeria, currently we have many political parties with two main parties competing with each other. When people got fed up of PDP, dey tried out APC. Imagine if PDP was d only party with no rival....

Competition favours consumers.
You can switch to another manufacturer or seller of a product if one is fucking up.

The list is endless....
Feel free to add yours.