This visa form falls under the UK settlement route
This visa type allows these types of settlement applications:
Tier 1, Tier 2 & PBS Dependants, UK Ancestry, Accelerated Employment not requiring a work permit
Accelerated Retired persons of independent means
Bereaved partner Biometric immigration document (Biometric Residence Permit)
Highly skilled migrant under the terms of the HSMP indefinite leave to remain (ILR) Judicial, review
Representatives of an overseas business
Other purposes/reasons not covered by other application forms
Depending which visa you currently hold, will determine what evidence you need to submit to UKVI