Interested in Language
In the following sentence, is the definite article not required? I feel it is required. I would like to know your opinion.
Books such as Do’s and Taboos around the World and Kiss, Bow, or Shake Hands have become increasingly popular as well as useful for the savvy professional in any sector.
It's required. Sometimes we use "the + singular noun" to mean "any + noun". With "professional" it's required. If it said "professionals", no article would be required.
Remember - if you don't use correct capitalisation, punctuation and spacing, anything you write will be incorrect.