The most loyal customer is a repeat customer or one who regularly uses a company‘s services and purchases its products. This type of customer is the lifeblood of the business and should be respected as such.
Because they were satisfied the first time, they returned for more services or products. Therefore, as long as you continue to satisfy their needs, you have a repeat customer.
It has been estimated that it can take up to five times more work to replace a loyal customer as it would to simply continue to service them well enough to keep them.