This is the 741st most frequent Bulgarian word.
информационна
"Informational" or "relating to information."
In this sentence, "информационна" describes "статия" (article), indicating that the article is meant to convey information.
Тя работи върху информационна статия за местната култура.
She is working on an informational article about the local culture.
The word "информационната" (a form of "информационна") here functions as an adjectival describer of "подготовка" (preparation), underlining the preparational aspect's focus on information.
Информационната подготовка е важна за всеки проект.
Informational preparation is important for every project.
Here, "информационна" modifies "система" (system) as an adjective, meaning informational or related to information.