Use one of these as per your requirements.
Open the linked document in a new window or tab:
<a href="xyz.html" target="_blank"> Link </a>
Open the linked document in the same frame as it was clicked (this is default):
<a href="xyz.html" target="_self"> Link </a>
Open the linked document in the parent frame:
<a href="xyz.html" target="_parent"> Link </a>
Open the linked document in the full body of the window:
<a href="xyz.html" target="_top"> Link </a>
Open the linked document in a named frame:
<a href="xyz.html" target="framename"> Link </a>