Physical access versus legal access
Physical access means there is a way to reach the property on the ground. Legal access means you have a recorded right to use that way. Parcels frequently have one without the other.
A dirt track that neighbors have tolerated for thirty years may not appear in any recorded document, and that gap becomes visible during title review.
What an easement does
An easement is a recorded right to cross land you do not own, usually to reach your own. Its terms — width, purpose, who maintains it — are written into the document and matter as much as its existence.
Landlocked parcels
A landlocked parcel has no recorded access to a public road. These properties are not impossible to sell, but they are evaluated differently and generally take longer to review.
What to tell a buyer
Describe what you know plainly: how you would drive there, whether you cross anyone else's property, and whether you have ever seen an easement document. Uncertainty is fine. Guessing confidently is what causes problems later.
Access questions can have legal consequences. For anything specific to your property, consult a qualified attorney or title professional.