My elder brother is alawyer,he A lawyer is a person who practices law,you can call him an advocate
awesome what does a lawyer do?
The work of a lawyer is quite demanding,involves the practical application of abstract legal theories and knowledge to solve specific individualized problems, 
Ok are the roles different for different countries?
Their role of the lawyer varies greatly across legal jurisdictions, and so it can be treated here in only the most general terms.
ok interesting what more can you tell me
Barrister
A barrister is a type of lawyer in common law jurisdictions. Barristers mostly specialise in courtroom advocacy and litigation. Their tasks include taking cases in superior courts and tribunals, drafting legal pleadings, researching the philosophy, hypothesis and history of law, and giving expert legal opinions. Often, barristers are also recognised as "legal scholars".
Barristers are distinguished from solicitors, who have more direct access to clients, and may do transactional-type legal work. It is mainly barristers who are appointed as judges,
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