An employer offers a service giving employees access to someone who can provide help and advice. What is this service called?

The service being described, where employees can access someone to provide assistance and guidance, is commonly referred to as a "helpline." This term specifically indicates a line of communication set up to offer help, often through telephone, email, or online chat, which connects individuals seeking support with trained professionals or advisors. Helplines are typically designed to address a range of issues such as emotional support, mental health, and various work-related problems.

While the other terms can relate to similar supportive services, they don't capture the specific function implied in the question as effectively. An advisory service typically provides consultations but may not operate on the same immediate access framework as a helpline. A wellness program usually refers to broader health and wellness initiatives offered by an employer, rather than immediate and personal advice. Finally, a support line is often synonymous with a helpline but can have different connotations depending on the context; however, "helpline" is the more widely recognized term for direct access to assistance.