Question

She found red and green wavy lines under some of the words in a text what is the problem and how will it resolved?

Answer 1

those are coming when the word is special or incorrect

Answer 2

Most of the newer versions of windows operating system has a pre-installed spelling checking algorithm.

That's why whenever we are typing something ,the algorithm automatically starts checking the typed text.

Whenever there is a spelling mistake ,the mispelled spelling is underscored with a red wavy line and whenever there is a grammatical mistake,the mistaken grammar portion is underscored with a green wavy line.