Difference between cookie and session

Five differences ：

Storage location ：Cookie Store on client ,Session Store on the server

Security ：Cookie unsafe ,Session Security

Storage size ：Cookie Maximum 3kb,Session unlimited

Survival time ：Cookie Long term storage ,Session Default 30 minute

Server performance ：Cookie No server resources ,Session Occupy server resources

Be careful ：

Server down ,Session Can recover

Browser closed ,Session Can't recover , because Session Of ID Does not exist.