I am a lawyer. I practice law and work as a barrister. Have you ever needed a lawyer?
I have not.
I work daily with the practical application of law and legal theories. It's a lot of fun. 
Is a barrister a special type of lawyer? I've never heard that term before.
Yeah, they are a  lawyer in common law jurisdictions. So we work on specific cases. 
Typical criminal cases or civil?
Common law
In law, common law (also known as judicial precedent or judge-made law, or case law) is that body of law derived from judicial decisions of courts and similar tribunals. The defining characteristic of “common law” is that it arises as precedent. In cases where the parties disagree on what the law is, a common law court looks to past precedential decisions of relevant courts, and synthesizes the principles of those past cases as applicable to the current facts. If a similar dispute has been
Lawyer
A lawyer or attorney is a person who practices law, as an advocate, attorney, attorney at law, barrister, barrister-at-law, bar-at-law, canonist, canon lawyer, civil law notary, counsel, counselor, counsellor, solicitor, legal executive, or public servant preparing, interpreting and applying law, but not as a paralegal or charter executive secretary. Working as a lawyer involves the practical application of abstract legal theories and knowledge to solve specific individualized problems, or to advance