Salesforce supports 2 kinds of relationships like Master Detail and Lookup. They are both one-to-many relationship, and they are both defined from the many-to-one side, that is from a child to a parent. They can be made one-to-one relationship by adding validation rules, or maybe triggers to enforce the one-to-one nature, i.e. only one child is allowed.
Junction objects are used to create many to many relationships between objects. If you take the Recruiting application example, you can see that a Position can be linked to many Candidates, and a Candidate can apply for different Positions. To create this data model you need a third object "Job Application" that links the 2
standard junction objects:
1) between campaign and contact object salesforce provides many to many relationship by creating a junction object "campaignmember".
2) between contact and opportunity salesforce provides many to many association by creating junction object "opportunitycontactrules"
3)between opportunity and product salesforce provides many to many association by creating junction "opportunitylineitem"
4)product and priceboo salesforce provides many to many association by creating junction object "pricebookentry"
5)user and permissionset salesforce provides many to many association by creating junction object "permissionsetassignment"
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