System API > Resources > Assets
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Assets are what we call servers or network devices. They can be any publicly accessible device with an IP address.
This is the top of our hierarchy. Your use-case may only need Assets and their directly related monitors - Ping and TCP tests. For example, you may wish to monitor an FTP server. This would just require a Ping monitor and a TCP monitor for port 21.
However, if one of your Assets is a web server then you can creat Website children that then subsequently own monitors themselves; HTTP, Whois, SSL, Moz, Alexa etc.