Help me read "top" result

Code: 
19:16:59  up 4 days, 20:43,  1 user,  load average: 0.00, 0.02, 0.00
93 processes: 92 sleeping, 1 running, 0 zombie, 0 stopped
CPU states:  cpu    user    nice  system    irq  softirq  iowait    idle
           total    0.0%    0.0%    0.0%   0.0%     0.0%    0.0%  100.0%
Mem:   505400k av,  483616k used,   21784k free,       0k shrd,  100880k buff
                    364380k actv,      24k in_d,    9084k in_c
Swap:  522104k av,    6052k used,  516052k free                  245496k cached
Hello, here is my "top" result, anyone here can you give some explanation about the last two lines. I don't understand anything at all...

 

 

 

 

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