This is the 209th most frequent Russian word.
связи
Connections, ties, or relationships.
Refers to "connections" in a biological or structural sense, such as neural connections.
Изучение новых связей в мозге может помочь в лечении болезней.
Studying new connections in the brain may help in treating diseases.
"Связь" is used here to mean "signal" or "communication signal" in technological communication contexts.
Из-за отсутствия связи он не смог дозвониться.
Due to lack of signal, he couldn't make the call.
Used as "connections" typically referring to networks or acquaintances.