This is the 3032nd most frequent Russian word.
заложена
"Zalozhena" means "laid, embedded, pledged, or set, depending on context."
Here, "заложен" is used in the context of construction, indicating the act of laying a foundation.
Фундамент здания заложен вчера.
The building's foundation was laid yesterday.
In this sentence, "заложена" signifies that an idea is embedded or contained within the book.
В книге заложена важная идея.
An important idea is embedded in the book.
The usage of "заложена" here implies that a program is included or incorporated in the new project.