When it comes to pronunciation, yore and your are pronounced the same way. But there the similarity ends. While your is used in almost all contexts, yore is considered to be rather old fashioned and literary, and is therefore restricted in its use. It is mostly used in certain fixed expressions like of yore. It means long ago.
• The old women spent their time talking about the days of yore.
• This huge building was used as a stable in days of yore.