Could someone explain the difference Content Resolver and Item Resolver?

I see for Content Resolver we create the resolver item in sitecore modules where as for Item Resolver we add it in patch file.

When I feel both does the same job. Please clarify

Could someone explain the difference between Content Resolver and Item Resolver?

I see for Content Resolver, we create the resolver item in sitecore modules whereas for Item Resolver, we add it in patch file.

I feel both does the same job. Please clarify.

Could someone explain the difference Item Resolver and Item Processor?

I see for Item Resolver we create the resolver item in sitecore modules where as for processor we add it in patch file.

When I feel both does the same job. Please clarify

Could someone explain the difference Content Resolver and Item Resolver?

I see for Content Resolver we create the resolver item in sitecore modules where as for Item Resolver we add it in patch file.

When I feel both does the same job. Please clarify