LAWYERS

A lawyer, according to Black's Law Dictionary, is "a person learned in the law; as an attorney, counsel or solicitor; a person licensed to practice law."Law is the system of rules of conduct established by the sovereign government of a society to correct wrongs, maintain stability, and deliver justice. Working as a lawyer involves the practical application of abstract legal theories and knowledge to solve specific individualized problems, or to advance the interests of those who retain (i.e., hire) lawyers to perform legal services.
The role of the lawyer varies significantly across legal jurisdictions, and so it can be treated here in only the most general terms

TERMINOLOGIES

In practice, legal jurisdictions exercise their right to determine who is recognized as being a lawyer; as a result, the meaning of the term "lawyer" may vary from place to place.
In New Zealand and Australia the word "lawyer" is used to refer to both barristers and solicitors (whether in private practice or practising as corporate in-house counsel).
In Canada, the word "lawyer" only refers to individuals who have been called to the bar or have qualified as civil law notaries in the province of Quebec. Common law lawyers in Canada may also be known as "barristers and solicitors", but should not be referred to as "attorneys", since that term has a different meaning in Canadian usage. However, in Quebec, civil law advocates (or avocats in French) often call themselves "attorney" and sometimes "barrister and solicitor".
In England, "lawyer" is used loosely to refer to a broad variety of law-trained persons. It includes practitioners such as barristers, solicitors, legal executives and licensed conveyancers; and people who are involved with the law but do not practise it on behalf of individual clients, such as judges, court clerks, and drafters of legislation.
In India, the term "lawyer" is often colloquially used, but the official term is "advocate" as prescribed under the Advocates Act, 1961.
In Scotland, the word "lawyer" refers to a more specific group of legally trained people. It specifically includes advocates and solicitors. In a generic sense, it may also include judges and law-trained support staff.
In the United States, the term generally refers to attorneys who may practice law; it is never used to refer to patent agents or paralegals.
Other nations tend to have comparable terms for the analogous concept

RESPONSIBILITIES
In most countries, particularly civil law countries, there has been a tradition of giving many legal tasks to a variety of civil law notaries, clerks, and scriveners. These countries do not have "lawyers" in the American sense, insofar as that term refers to a single type of general-purpose legal services provider; rather, their legal professions consist of a large number of different kinds of law-trained persons, known as jurists, of which only some are advocates who are licensed to practice in the courts. It is difficult to formulate accurate generalizations that cover all the countries with multiple legal professions, because each country has traditionally had its own peculiar method of dividing up legal work among all its different types of legal professionals.
Notably, England, the mother of the common law jurisdictions, emerged from the Dark Ages with similar complexity in its legal professions, but then evolved by the 19th century to a single dichotomy between barristers and solicitors. An equivalent dichotomy developed between advocates and procurators in some civil law countries, though these two types did not always monopolize the practice of law as much as barristers and solicitors, in that they always coexisted with civil law notaries.
Several countries that originally had two or more legal professions have since fused or united their professions into a single type of lawyer. Most countries in this category are common law countries, though France, a civil law country, merged together its jurists in 1990 and 1991 in response to Anglo-American competition. In countries with fused professions, a lawyer is usually permitted to carry out all or nearly all the responsibilities

LEGAL ADVICE

Legal advice is the application of abstract principles of law to the concrete facts of the client's case in order to advise the client about what they should do next. In many countries, only a properly licensed lawyer may provide legal advice to clients for good consideration, even if no lawsuit is contemplated or is in progress. Therefore, even conveyancers and corporate in-house counsel must first get a license to practice, though they may actually spend very little of their careers in court. Failure to obey such a rule is the crime of unauthorized practice of law.
In other countries, jurists who hold law degrees are allowed to provide legal advice to individuals or to corporations, and it is irrelevant if they lack a license and cannot appear in court. Some countries go further; in England and Wales, there is no general prohibition on the giving of legal advice. Sometimes civil law notaries are allowed to give legal advice, as in Belgium. In many countries, non-jurist accountants may provide what is technically legal advice in tax and accounting matters