In a basic twoway ANOVA, there are two independent variables and they are crossed to form several independent groups. A twoway ANOVA is just the simplest of a set of ANOVA procedures for factorial designs, called factorial ANOVAs.
ANOVA Summary Table for a TwoWay ANOVA 

Source 
df  SS  MS  F  p 
Factor A  dfA=a1  SSA  MSA=SSA/dfA 
F=MSA/MSw 

Factor B  dfB=b1  SSB  MSB=SSB/dfB  F=MSB/MSw  
AB interaction  dfAB=dfAXdfB  SSAB  MSAB=SSAB/dfAB  F=MSAB/MSw  
Within  dfw=Nab  SSw  MSw=SSw/dfw  
Total  dfT=N1  SST 
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