Add link out to main Cache docs tile

Author: RebeccaTamachiro

src/content/docs/smart-shield/index.mdx

@@ -7,10 +7,18 @@ head:
     content: Overview
 ---
 
-import { Description, Plan } from "~/components";
+import { Description, Plan, RelatedProduct } from "~/components";
 
 <Description>
 Safeguard your origin with just a few clicks.
 </Description>
 
-Smart Shield acts as an intermediate caching layer between Cloudflare's content delivery network and your origin server, consolidating multiple requests from various locations into a single request. Combined with connection reuse, this approach significantly reduces origin load while improving website and application performance.
+Smart Shield acts as an intermediate caching layer between Cloudflare's content delivery network and your origin server, consolidating multiple requests from various locations into a single request. Combined with connection reuse, this approach significantly reduces origin load while improving website and application performance.
+
+***
+
+## Related products
+
+<RelatedProduct header="Cache" href="/cache/" product="cache">
+Cache stores copies of frequently accessed content (such as images, videos, or webpages) in geographically distributed data centers that are located closer to end users than origin servers, improving website performance.
+</RelatedProduct>