This value holds the SNMP community string, 1 to 64 characters, that will be embedded in trap messages sent to a particular receiver row, alongside that receiver's IP address and status in the trap-receiver table. An administrator sets this to match whatever community string the receiving management station expects, so it will accept and process the incoming traps rather than discard them. For example, setting this to "public-traps" for a given receiver means every trap sent to that station's IP will carry that community string.