What are missing values? What are the strategies to handle them?

Q. What are missing values? What are the strategies to handle them?

Answer :-

If a value corresponding to a column is not present, it is considered to be a missing value.
A missing value is denoted by NaN.

The two most common strategies for handling missing values explained in this section are:
i)  drop the object having missing values,
ii) fill or estimate the missing value