body="&amp;lt;p&amp;gt;A sidecar, generally, is a container that runs alongside a primary application to provide additional functionality.
In Istio, sidecar mode is a &amp;lt;a href=&amp;#34;/docs/reference/glossary/#data-plane-mode&amp;#34;&amp;gt;data plane mode&amp;lt;/a&amp;gt; that runs an &amp;lt;a href=&amp;#34;/docs/reference/glossary/#envoy&amp;#34;&amp;gt;Envoy&amp;lt;/a&amp;gt; proxy alongside each
&amp;lt;a href=&amp;#34;/docs/reference/glossary/#pod&amp;#34;&amp;gt;Pod&amp;lt;/a&amp;gt;.&amp;lt