ANOVA results interpretation

Hi, I attached ANOVA results. What is the meaning of sum of squares and mean square? How can I interpret the ANOVA result by the meaning of sum of squares and mean square?

Source/Sum of squares/ Degrees of freedom/ Mean square F p-value
A/ 19.29 / 2 / 9.64 / 31.83 /< 0.0001
B/ 0.60 / 2 / 0.30 / 10.32/ 0.0168
C/ 4.42 / 4 / 1.10 / 38/ 0.0006
AB/ 0.09 / 4 / 0.02 / 0.77/ 0.5879
AC/ 17.18 / 8 / 2.15 / 73.89 /< 0.0001
BC / 0.10 / 8 / 0.01 / 0.42/ 0.8654