Deprecated HTML tags are old tags replaced by updated alternatives in modern web design and development. Changes in web standards, semantic structure, and accessibility all contribute to deprecation, with the most significant influence stemming from the separation of Hypertext Markup Language (HTML) and external style sheets like Cascading Style Sheets (CSS).

Many HTML tags are no longer recommended for modern use as they may become obsolete in future versions of HTML, but some still effectively perform their operations. 

Here’s a table showing some deprecated terms against their modern replacements:

Deprecated term Modern alternative
<acronym> <abbr>
<applet> <object>
<center> <text-align:center>
<image> <img>
<isindex> <input>

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