This is the 1674th most frequent Russian word.
служба
"Service" or "duty."
Here, 'служба' means 'service' in the context of military service, a formal duty performed for the country.
Он приступил к службе в армии.
He began his service in the army.
In this sentence, 'служба' denotes a 'service', especially a technical support function assisting people with a specific need.
Я позвонил в техническую службу поддержки.
I called the technical support service.
Here, 'служба' refers to a 'service', specifically a postal or mailing service organization providing mail-related operations.