Clients are long-term loyal customers with a collaborative relationship with a vendor who solves complex and important problems.

Clients have an ongoing relationship and often need personalized services or expertise assistance. For example, A lawyer, doctor, nurse, mental health counselor or a web designer would fall in the category of providing personalized service while solving problems.

On the other hand, a customer is a patron of a business, buying one-off products and engaging in a transactional relationship with a vendor.

Customers who do one-time or occasional transactions. Shopping for goods or services fall into this category. So then a notary would have customers that they serve as most often customers provide one-time transaction.