Difference Between DOS And DDOS Attack

1.DOS Attack.

DOS Ka Matlb Hta Hai "Denial Of Service".Ye Attack Just 1 Person 1 Hi Waqt Main  Krta Hy Kisi Server,

Website Etc. py Aur Usy Down Krny Ki Koshish Krta Hy.In Simple Words " DOS Is A Attack On Server At One Time By Only One Person"..

2.DDOS Attack.

DDOS Ka Matlb Hta Hy "Distributed Denial Of Server".Agr Koi Hacker 1 Server,Website DOS Attack Sy Hack Ni Kr Sakta To Wo Apny Friends Ko Sath Mila Kr Different Computers Sy 1 Hi Waqt Main Server Py Attack Krty Hain.In Simple Words "If  You Have Multiple Computers In Control To Initiate Attack you move from DOS to DDOS Attack."