What is the latest service pack?

Right now I have service pack 3. Is it the latest SP for XP Home Edition? If not, can you show me where I can download the latest SP please?

xp sp 4 is the last for xp it contains all the last updates can be got from major geeks (look under system on home page) or from internet archive ( cd rom software) both are free to download will also be able to get xp sp3 on same disk from both
long live xp :)