What is a Zabbix Agent ?

[jeanvaljean]

Hello

Excuse me, but I've try to read some ressource (and I don't speak english very well) but I cannot understand what is really an zabbix agent ?
In fact I don't understand the difference between an zabbix agent and an snmp agent ?

Thank you very much !

[zabbix_zen]

http://www.zabbix.com/documentation/.../zabbix_agentd