Hello avinash

Is this a Class or Homework question?

The Rules at Forum, states these are not answered here.

I trust that you have read the Forum Rules, and that your Question is genuine.

You note that I have used "ball lightning" (Note correct spelling of "lightning") inside quote marks, so those words in the Search engine are coupled in that order.

The word 'wiki', without quote marks, refers to the huge on-line free Encyclopedia = Wikipedia.

Please refer to Google Results 1 - 10 of about 10,200 for "ball lightning" wiki. (0.24 seconds)

http://en.wikipedia.org/wiki/Ball_lightning

There you may read your answer.

Learn how to use an Internet Search Engine, it will give you fast answers, and you will learn your answer in context, plus you will remember the answer, because you put in some personal effort.

Kind Regards....