The Contact sits under a Company and is where other records, like Opportunities, Problems and Quotes, can be created.
From a Contact, you're able to view all Opportunities, Problems, Quotes etc. which sit under the Contact.
Selecting one of the pages on the left-hand side will show any records created at any level of the hierarchy under the Contact.
Additional records can be created from a Contact. This is done by selecting the plus icon on the right-hand side.