'Why do we use "&cell_reference&" in Excel?

Lets say we have a table like this:

	A	B
1	Aaron	20
2	Bob	30

What is the difference between =""&A1&" has "&B1&" cakes" and = A1 & " has " & B1 & " cakes"?

Why do we use "&cell_reference&" anyways?

excel-formula

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