Question: What is the difference caused by using “nope” instead of ”no”?

Is it used because “nope” sounds better and not straight like “no”? In some situations, it feels like *nope* is better to use than *no* even though it adds 2 more characters. What is the reason why many use it?

Answer: 
In my opinion Nope is a dismissive and slightly rude version of no. Nope should never be used in a professional context e.g. it should never be used as an option for web site or search engine users to select as a response to a question, because it makes the company using it look un-professional and rude to their customers. The use of the word nope by Google and others makes me cringe so much that I will never click on it in response to a question.
I agree with the person who says that nope is dismissive and slightly rude and I would add that a text nope feels rude to the recipient. It feels like a "final" no.