die Italienerin
Italian woman
A female person who comes from Italy or has Italian citizenship.
Unsere neue Nachbarin ist Italienerin und hat uns zum Essen eingeladen.
Our new neighbor is an Italian woman and invited us over for dinner.

Italian woman
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Italian woman
A female person who comes from Italy or has Italian citizenship.
Unsere neue Nachbarin ist Italienerin und hat uns zum Essen eingeladen.
Our new neighbor is an Italian woman and invited us over for dinner.

The word is derived from the country 'Italien' (Italy). The ending '-erin' is the typical German ending for female person nouns derived from nationalities or professions.
Die berühmte Sängerin ist Italienerin.
The famous singer is an Italian woman.
As a noun that refers to a person, 'Italienerin' (Italian woman) is always capitalized. This is also the case when it comes after the verb 'sein' (to be), unlike the lowercase adjective 'italienisch' (Italian).
Meine beste Freundin ist Italienerin.
My best friend is an Italian woman.
You can use the word as a predicate noun after 'sein' (to be) to indicate origin. You can also use it like any other noun as the subject or object in a sentence.
Die neue Chefin ist Italienerin.
The new boss is an Italian woman.
Italian
'italienisch' and 'die Italienerin' are both connected to Italy, but grammatically they belong to different groups. 'italienisch' is an adjective and describes, for example, food, music, culture, or language. 'die Italienerin' is a noun and means a female person from Italy or with Italian citizenship. They are easy to confuse because both refer to Italy. If you are describing a thing or quality, use 'italienisch'. If you are talking about a woman, use 'die Italienerin'.

Adam spricht vor dem Termin mit einer Italienerin aus seinem Sprachkurs.
Before the appointment, Adam talks with an Italian woman from his language course.
Im Restaurant bestellen wir heute italienisches Essen.
At the restaurant, we’re ordering Italian food today.