You have to be aware that such contact roles are the standard Salesforce object that would define the contact's level of influence in relation to that sales opportunity. Well, they are necessary object for the Pardot Admins. As any Pardot Marketer knows, the prospects are actually closely related with their associated contact record. Be aware that working at that prospect or the contact level permits you to build personalized marketing experience for each person. This means that in the Salesforce, those contact records don't have a direct relationship with those Opportunities.
Know that the opportunities have that relationship with the account record and also the account has that relationship with the contacts but there is no direct relationship. To have this addressed, Salesforce created an object called the Contact Roles which makes a link between the contacts and the roles which they are playing in the Opportunity.
You must know that each contact role has four standard fields and they are the name of the contact, the job title, the role that are actually default roles that include the evaluator business user and the decision maker and also the primary that is a checkbox field which you may use to single out a contact.
With the contact roles, what you see is what you actually get. This is an object that is actually functional but this isn't flexible. You should also be aware that the biggest limitation which could stump such developers and admins is that the custom fields can't be placed. Such can be disappointing in situations where you want the contact object to update such opportunity or do the reporting on the contact and opportunity together. You cannot also run validation rules or such triggers from those records. Be sure to check it out!
Also, you have to know that the contact role information data may not be viewable or usable in the Pardot. Such are still quite important for the Pardot Admins. Check out this website at https://www.britannica.com/topic/marketing/Services-marketing to know more about marketing.
There is definition of the part of the person account or contact being played in an opportunity, account, case or contract. For example one could be the decision maker of the opportunity and the other functions as the evaluator. You may certainly assign such contact role to any contact or that person account which would affect the case, the account, contract or such opportunity. The contacts and those person accounts may have different contact roles on various accounts, cases, opportunities or contracts.
Those contact roles which are related list of the account, contract or case would display the roles that every contact person account plays in such particular record. Be sure to read more here!