executed code and explained how it worked

Author: sayeedhussain01

Sprint-1/4-stretch-explore/chrome.md

@@ -12,7 +12,11 @@ invoke the function `alert` with an input string of `"Hello world!"`;
 
 What effect does calling the `alert` function have?
 
+1. alert function display a pop-up message box in the browser containing text "hello world"
+
 Now try invoking the function `prompt` with a string input of `"What is your name?"` - store the return value of your call to `prompt` in an variable called `myName`.
 
 What effect does calling the `prompt` function have?
 What is the return value of `prompt`?
+
+2. calling a prompt display a pop-up message box and ask for user input and prompt return a text entered by user as string.