Why do I have so many connections

I ran this command to find the number of connections

SELECT db_name(dbid) as DatabaseName, count(dbid) as NoOfConnections,
loginame as LoginName
FROM sys.sysprocesses
WHERE dbid > 0
GROUP BY dbid, loginame

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Here are my results.  Why does the master have 18 open connections.  How does that happen.  I only use one database that is callled CAPRegisters

DatabaseName	NoOfConnections	LoginName
msdb	2	NT AUTHORITY\NETWORK SERVICE                                                                                                    
ReportServer	1	NT AUTHORITY\NETWORK SERVICE                                                                                                    
master	18	sa                                                                                                                              

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