A newsletter is an electronically distributed regular publication. The newsletter usually focuses on one topic based on the subscriber’s interest. Since email became more preferred compared to traditional letters, newsletters also quickly became a widely popular way to inform people.
Sending newsletters is a sufficiant way of informing for providers, since they can be easily sent out at once for a large number of users. It is important to note that newsletters can only be sent to people who have given permission to the provider. Advertisement materials distributed without permission are qualified as spam.