xxx.yyy.com (or 18.104.22.168) -- this is the host name (or Internet protocol (IP) address) associated with the requester (you as the visitor). In this case, the requester is coming from the xxx.yyy.com address. Depending on the requester's method of network connection, the host name (or IP address) may or may not identify the user's specific computer. Connections via many Internet Service Providers (ISP) assign different IP addresses for each session, or only connect to the Internet via proxy servers, so the host name may only identify the ISP. The host name (or IP address) may identify a specific computer if that computer has a fixed IP address.
[28/Jan/2008:00:00:01 -0500] -- this is the date and time of the request
"GET /Defense/news/nr012708.html HTTP/1.0" -- this is the location of the requested file
200 -- this is the status code - 200 is OK - the request was filled
16704 -- this is the size of the requested file in bytes
Mozilla 3.0 -- this identifies the type of browser software used to access the page, which indicates what design parameters to use in constructing the pages
www.google.com -- this indicates the last site the person visited, which indicates how people find the requested file.
The types of data that Google Analytics anonymously collects can be found here.