Telemarketing is a direct marketing method where salespeople reach out to potential customers via phone or web conferencing to make sales. It can be both outbound and inbound and is used by various organizations for sales and fundraising, but it has a negative image among consumers that can harm a business's reputation. The effectiveness of telemarketing depends on the skills of the callers and the quality of the prepared scripts, but outsourcing it can lead to higher costs and reduced control over the process.