UK immigration runs on several distinct visa families, each with its own rules: work-based routes like the Skilled Worker and Health & Care Worker visas, family routes like the Spouse, Parent and Adult Dependent Relative visas, study routes through the Student and Graduate visas, and settlement routes like Indefinite Leave to Remain and naturalisation. Income thresholds, endorsing-body requirements and processing times vary significantly between them — the guides below break down each route individually, checked against gov.uk.