- I have sent this e-mail to Aman also.
- I have sent this e-mail to Aman too.
Which one is correct? What is the exact difference between the two? Please explain.
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In the context you are asking about, the two words are very synonymous, so there is no "exact difference" between the two.
When I am choosing one over the other, my choice is often based on style, and how they sound. For example, in this sentence, I would use also, simply because it sounds better (who wants to say "two-too"?):
When I asked if they wanted a slice of bread, Jim asked for two, and Jane asked for two, too.
When I asked if they wanted a slice of bread, Jim asked for two, and Jane asked for two, also.
Moreover, this is a generality, but I think also usually sounds better in technical writing; it seems slightly more formal:
The graph shows that the function f(x) is continuous, and g(x) is continuous, also.
At the beginning of a sentence, also just about always the better word:
Also, I sent this email to Aman yesterday.
However, at the end of a sentence, when you're indicating "as well", there's really not much difference in which one you use (although a comma is generally used before too in this context):
I have sent this e-mail to Aman also.
I have sent this e-mail to Aman, too.
When used like you have here to mean as well, or in addition to, they are interchangeable.