Functions:
Ti = internal logic, Te = external action, Ni = convergent meaning, Ne = divergent meaning, Se = current experience, Si = past experience, Fi = individual emotion, Fe = collective emotion. 
Types:
INTP=TiNeSiFe INFP=FiNeSiTe INFJ=NiFeTiSe INTJ=NiTeFiSe ENTP=NeTiFeSi ENFP=NeFiTeSi ISTP=TiSeNiFe ISFP=SeFiTeNi ISFJ=SiFeTiNe ISTJ=TeSiNeFi ENTJ=NiTeFiSe ENFJ=NiFeTiSe ESTJ=TeSiNeFi ESFJ=FeSiNeTi ESFP=SeFiTeNi ESTP=SeTiFeNi
The other four functions are just I/E switched.