What is the 90-day reporting requirement for long-term visas in Thailand?

The 90-day reporting requirement in Thailand necessitates that holders of certain long-term visas report their current address to the local immigration office every 90 days. For a visa granted for 5 years that allows stays of up to 180 days, the holder must either exit Thailand and re-enter or apply for a 180-day extension from the local immigration office. The process includes filling out the TM47 form, which can be submitted in person or via a visa agent for the initial report, while subsequent reports can be done online.