what is the difference between concatenate and cross joiner (not joiner node)

Could you someone help me to know the difference between concatenate and cross joiner (not joiner node)? Thanks a lot!

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Table 1:
a
b
c

Table 2:
1
2

Concatenate (3 rows + 2 rows = 5 rows):
a
b
c
1
2

Cross Joiner (3 rows x 2 rows = 6 rows):
a 1
a 2
b 1
b 2
c 1
c 2
 

Thank you very much!