Diversity is Different groups in a particular place, kind of like a community, but it can also be on a cultural scale. Ethnicity is what culture we’re from and what our traditions are, It includes, Language, Customs, Values, Rights. Diversity and Ethnicity are closely linked as nowadays different place has different types of people which are basically diversity and that diversity includes different ethnic groups. The most common example of this is Austria-Hungary:

Many Places are diverse and complicated, like Europe, and Africa where there are many traditions and cultures. First, we should start with one of the most diverse country; Pakistan and work our way through, with more diverse countries.

Pakistan has a very large population and the ethnic minorities are massive, Pakistan is very diverse. In the south we have, Balochs, Brahui’s, Sindhi’s, Karachites, and many more ethnic groups. In the middle, we have Punjabi’s and Paktuns. In the north, there are Baltis and Kashmiris. Religious Majorities can include.

Islam
Christians
Hindus
Parsis
Ahmadis  
 

India

India has an immense population of over 1.3 billion people, which means India has a very diverse community. To start off. India’s ethnic group is made of Hinduism, Islam, Sikhism, and much more. India itself has a large culture and diverse traditions. For religious  Majorities 

Hinduism 94% of Hindus live in India
Islam 
Christianity 
Sikhism
Buddhism
There are so many ethnic and diverse groups in India It is Impossible to cover all of them right now.

Here are some. Indo-Aryan people.

Iranic people.

Nuristani people.

Dravidian people.

Austroasiatic people.

Tibeto-Burmese people.

Andamanese and Nicobarese groups.

Semitic people.

Austria-Hungary

When observed from a map, Austria-Hungary is absurdly diverse. In the east, there are Germans and Czechs. Croatians, and Transylvania, heavily overwhelm the south, Hungary itself is in the center. The population of Austria-Hungary if it were to exist now would be 86 million people, which makes its ethnic background small while the diverse group expands around. For religious Minorities

Christianity
Jewish
Atheists
Islam
And much more diverse religious sets.

There are many more examples like this but this is all I will cover. Different places have different cultures and traditions according to where they live.