This is the 11001st most frequent Russian word.
гарантирует
"Guarantees" or "ensures."
Here, 'гарантирует' is used as a verb in present tense, singular, and third person, indicating an assurance or promise about the quality.
Она гарантирует высокое качество своих услуг.
She guarantees high quality of her services.
In this sentence, 'гарантирует' again functions as a verb, emphasizing the role of the certificate as providing verification.
Этот сертификат гарантирует оригинальность продукта.
This certificate guarantees the authenticity of the product.
The verb 'гарантирует' is used metaphorically here, suggesting a cause-and-effect relationship.