der Inder
Indian man
A male person who comes from India or has Indian citizenship.
Der neue Programmierer in unserem Team ist ein Inder aus Bangalore.
The new programmer on our team is an Indian man from Bangalore.

Indian
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Indian man
A male person who comes from India or has Indian citizenship.
Der neue Programmierer in unserem Team ist ein Inder aus Bangalore.
The new programmer on our team is an Indian man from Bangalore.

The word 'der Inder' (Indian man) is derived directly from the country name 'Indien' (India). The feminine form is 'die Inderin' (Indian woman).
Mein Kollege kommt aus Indien, er ist Inder.
My colleague comes from India; he is Indian.
You can tell whether the person or the restaurant is meant from the verb. Verbs like 'gehen zu' (to go to), 'essen bei' (to eat at), or 'reservieren bei' (to reserve at) almost always point to the restaurant.
Ich habe gestern Abend bei einem sehr guten Inder gegessen.
I ate at a very good Indian restaurant yesterday evening.
The term 'der Inder' (the Indian) for a restaurant is very common, but colloquial. In more formal contexts, you would say 'indisches Restaurant' (Indian restaurant).
Lass uns heute Abend zum Inder gehen!
Let's go to the Indian restaurant tonight!
When the restaurant is meant, you use 'zum Inder gehen' (to go to the Indian restaurant; movement, accusative) and 'beim Inder essen/sein' (to eat/be at the Indian restaurant; location, dative).
Wir gehen heute zum Inder.
We're going to the Indian restaurant today.
Indian
'indisch' and 'der Inder' are both connected to India, but grammatically they are not the same kind of word. 'indisch' is an adjective and describes, for example, food, music, culture, or language from India. 'der Inder' is a noun and means a man from India, or colloquially also an Indian restaurant. Learners may confuse the words because they look similar. A practical rule is: if you are describing something, use 'indisch'. If you mean a male person or, colloquially, a restaurant, use 'der Inder'.

Mein Kollege ist Inder und spricht zu Hause Hindi.
My colleague is Indian and speaks Hindi at home.
Nach dem Essen sagt Tom, dass das Gericht sehr indisch gewürzt ist.
After the meal, Tom says that the dish is seasoned in a very Indian style.