Neerlandés vs. holandés
The Spanish words neerlandés and holandés both refer to the Dutch language and people, but they have slightly different usages and connotations.
Neerlandés
B2Neerlandés is the more formal and technically correct term for Dutch language and people from the Netherlands.
El idioma neerlandés es oficial en los Países Bajos.
(The Dutch language is official in the Netherlands.)
Ella estudia literatura neerlandesa en la universidad.
(She studies Dutch literature at the university.)
Holandés
A2Holandés is the more commonly used term in everyday Spanish, though it technically refers only to people from the regions of North and South Holland.
Mi amigo holandés vive en Ámsterdam.
(My Dutch friend lives in Amsterdam.)
Me encanta el queso holandés.
(I love Dutch cheese.)
Summary
While neerlandés is the more accurate term for Dutch language and people from the entire Netherlands, holandés is more commonly used in everyday Spanish. Neerlandés is preferred in formal or academic contexts, while holandés is more prevalent in casual conversation and general references to Dutch culture.