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@darth@silversword.online It's the matter of a different case in this word.

"Kobieta" is just a regular nominative (who? what?). "Kobietą" is instrumental case form (with whom? with what?). That is a more complex answer.

I imagine however that you wish to know why it is rather "jestem kobietą" than "jestem kobieta". In this second case, if you say to a typical Polish person "jestem kobieta" it would be understood like... you were saying that your name is "kobieta" and not to indicate that you are a woman (=your gender is woman).

Same would be with professions:
"Jestem lekarzem" (I am a doctor, my profession is doctor) instead of "Jestem lekarz" (I am doctor, probably name?)

https://mowicpopolsku.com/polish-grammar/cases/instrumental/