Combine two data frames with each row of first df1 with complete set of df2

Question

df1 df2

col1 col2 1 a 2 b 3 c

df3 col1|| col2 1 a 1 b 1 c 2 a 2 b 2 c 3 a 3 b 3 c

Combine two data frames with each row of first df1 with complete set of df2