# Why two words "summation" and "addition" do exist in literature?

We all come across these two words in literature: summation, addition.

I personally do not know any difference between them and I view both of them the same in all mathematical aspects.

Is there any case where I cannot use the two words interchangeably? If not, then why do these two words evolve?

• You could ask the same question about the two words product and multiplication.
– KCd
Nov 1 at 10:19
• @KCd The answers to this question might give a clue! Nov 1 at 12:30
• "Your salary was \$25000 per year and then they added \$5000 to it". Or "Bob robbed three banks: for \$30000, \$27500 and \$45000. Adding these numbers together the Judge put him in jail for 10.5 years". Nov 1 at 22:29 • This is the distinction between '$\sum$' and '$+$', and, directing attention to the comment by @KCd is similar to the distinction between '$\prod$' and '$\times$' (or '$\cdot\$', implicit binary multiplication, etc.) Nov 30 at 17:56