The purpose for which you apply for a long-term visitor visa varies on a case-by-case basis. Many applicants seek this visa because they have relatives, children, or parents settled in the UK and wish to visit them frequently without repeatedly applying for a visa. You can also apply for a long-term visitor visa if you have a company or a branch of your business in the UK and need to visit regularly. Additionally, this visa can be used if you require frequent visits to the UK for medical treatment. The specific purposes depend on individual circumstances.