Great question, Laura.
The answer is â€œit dependsâ€.
A condominium is a dwelling type where you own your respective unit (usually from the drywall/plaster inward), and you also own a share of ownership in the common elements of the entire development.
Examples of common elements you might find: Pools, picnic areas, tennis courts, lobby, common walls and utility elements, concierge service, security office, parking garage, tennis courts, etc.
A townhouse â€“ which is an architectural style â€“ can be attached or adjoining other homes and is sometimes also a Fee Simple home. In a Fee Simple townhouse you own the entire structure, the land, the sky above it etc, but you will have joint ownership and maintenance obligations of a common party wall and possibly other elements like a common roof depending on the structure. You will usually have a pro-rata shore of ownership in the common area and elements of the community.
To add to the confusion, a townhouse can also be a condominium.