The Real meaning of "Dharma" and its relation with "Karma"

I was searching this Question's Answer since last two years, why there is/was need of Dharma in Hindu Religion.

I thought that this difference of Several Dharma leads to Diversity between Human Beings.

I read Geeta, Some pages of Purans and Finally come up with the real and exact answer that what is the Term Dharma means, why it is necessary & how it is related with Karma?

The answer is, Dharma means Feild / Passion / Profession.

Wait what I said?

Yes, This is the exact answer and the reality!!!!!

Earlier, the Feilds / Professions was divided into 4 groups I.e.

Brahmin, Kshatriya, Vaishya And Shoodra

These were four Feilds or we can say Four Dharmas, Under which people were having their several Karmas (Duties).

Lets see practical Classification.

#Dharma :- Brahmin #Karma :- Teaching

#Dharma :- Kshatriya #Karma :- Protection of their community

#Dharma :- Vaishya #Karma :- Agriculture and provide food

#Dharma :- Shoodra #Karma :- Cleaning and Make the environment Clean and Fresh.

In this way the Professions were divided.

But now there are several professions.

Let's take my example,
What is my Dharma(Profession) :- Doctorship
And what is my KARMA(duty) :- To treat patients, Help others, and To consult people which makes their life better.

It is also said that we have to follow our Dharma, which really means as By doing our Duties (Karma) we have to be Honest with our Profession (Dharma)

 Friends If any one asks you that What is your Dharma, so tell your profession including your Duties (Karma).

Share this information with others and clear this one of the biggest doubt, and make them understand that Dharma does not causes diversity, it makes you Honest to your profession. 

Thank you