The key difference between professional services and consulting is that professional services are a broad term that encompasses several services, while consulting is an aspect of professional services. Both professional services and consulting consist of providing experience to a client or a client. Many types of consultants are considered to belong to the professional services industry. For example, marketing consultants and IT consultants can be grouped under the broader umbrella of professional services.
Professional service providers are likely to help clients manage a specific part of their business, while consultants usually have an area of specialization such as marketing, sales, IT, and so on.