lipi aur boli mein kya difference hota hai?

bhasha ke likhne ki vidhi ko lipi nkehte hain ...  parntu devnagri, gurumukhi, roman , 

boli ve bhasha he jisme sahitye ki rachna nahi hoti he . ye bhasha ka shetriye roop he aur sarkari kam kaj me ye istmal nahi ki jati he ...  use boli kehte hain  eg rajasthani, haryani, bhopali etc