A resource pool is a billing construct. In simple terms, it is a virtual 'bucket' of CPUs, RAM, Disk Space, etc, from which you can build, scale and manage your servers. You buy the aggregate total resources you need, and can make as many servers as you have resources for. You can scale servers within your pool, and scale the pool at any time. To review your currently available resources, just click into Resource Pool / Manage then click Resources.