CMDB and Asset

Please help me explain the relationship between Configuration Management Database(CMDB) and Asset. As I read " Unlike the asset database that comprises of a bunch of CIs, the CMDB is designed to support a vast IT structure where the interrelation between the CIs are maintained and supported successfully". Is asset and CMDB made by CI? And these CI with CIType "Track as asset" are Asset and all CIs (with CIType "Track as asset" or not) are CMDB that mean asset is Subset of CMDB? Could you give example of asset that include multiple CIs. By the way please let me know how can I get information of user who create CI?

Ngo Van Luu