Hello Srinath,

i hope you're doing well.I am glad you're here.

• Mass communication is the study of how people exchange information through mass media to large segments of the population at the same time. It is usually understood to relate newspaper,magazine, and book publishing, as well as radio, television and film, even via internet as these mediums are used for disseminating information, news and advertising.

• Public Relations (PR) is about managing communications, reputation, perceptions and relationships for organisation. It means attracting and retaining the support of customers, employees, investors, communities and other groups critical to a business's success. ... the skills to undertake a major communications role.

 

This was the basic description of the courses that      you asked for.As for you question regarding benefits of these course I would like to inform you that these courses will take to big firms where you will be assigned to enhace the relationship between customers and organistaions.
And masscom will take you to media sector.

Hope i answered well.

BEST OF LUCK FOR FUTURE!