Group insurance is an insurance that covers a group of people, for example the members of a society or professional association, or the employees of a particular employer for the purpose of taking insurance. Group coverage can help reduce the problem of adverse selection by creating a pool of people eligible to purchase insurance who belong to the group for reasons other than the wish to buy insurance. Grouping individuals together allows insurance companies to give lower rates to companies, "Providing large volume of business to insurance companies gives us greater bargaining power for clients, resulting in cheaper group rates." The concept varies internationally, with distinct practices and benefits in different countries, such as Canada and India. Additionally, group insurance policies can be either compulsory or voluntary, each with specific underwriting requirements and implications for coverage and premiums.