This is a fruit name without an escape slash Apple
This is a fruit name with an escape slash $fruit_name
This is an example of me quoting myself saying "Hello" cool isn't it?

Without telling that you want to echo out something like quotation marks the PHP language will get confused and think you're trying to add a variable, etc... Where as if you simply add the escape this will notify PHP to ignore it and not run that extra quote etc... As PHP.