How does the "other" option work when using it in questions?

It doesn't seem to register as a choice when "other" is an option in my multiple choice questions.  Also, is there the ability for people to type their answer in when they choose "other" as their answer?

You may add Other option for the Multiple choice questions by clicking on the 'Add Other option' or by enabling it from the Options tab of the field properties.

The other option for the question is displayed on the form with a text box as shown in the image below so that the user can enter the text into it.

Hope this information helps!