# FAQ: Vectors - Adding and Removing Elements

This community-built FAQ covers the “Adding and Removing Elements” exercise from the lesson “Vectors”.

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This exercise can be found in the following Codecademy content:

## FAQs on the exercise Adding and Removing Elements

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Hi,
In this exercise, why is the vector declare as “std::string” instead of just “string”?
Thank you,
Megan

@ajaxcoder74881 hey megan, the C++ `string` class is part of the `std` namespace. so you simply have to include it

great note tho. im going to add a hint in there just in case

Why do we need to use .push_back and .pop_back?
I mean what is their function?

to add/delete from a vector!

for example, suppose you are building a game and you want to keep track of an user’s friend or inventory list, you can create a vector that holds those people/items. and as they add a friend/item, you can use `.push_back()`. and as they delete a friend/item, you can use `.pop_back()`.

Hi! How can we pop-back a specific index and/or a specific value?

Edit: For when you want to change just one value maybe in the middle of the vector, not every value as in the Operations lesson under Vectors.