MIssing internal storage it says that internal storage is 8 GB and Ram is 2 GB.But while I can see only usable 3.65 GB internal storage.Where is the remaining memory goes?I am totally confused.Is Ram uses the 2Gb from this total 8 GB internal storage?I uninstall many apps from my phone.But it haven't give any good result.still usable memory get unchanged.Please help me.
You didn't name the device, but that's the usual way manufacturers fool their customers without lying: the storage chip has 8GB, but guess where the OS is installed? Looks like on your device, ~4GB are reserved for this (/system). Then there are other partitions on the very same storage chip, e.g. for /recovery and /cache. What's left in the end is /data – storage space available for apps etc. Those are your 3.65GB.

RAM doesn't play a role in this context, it usually goes to a different chip.

For additional details, please take a look at my answer on Android Folder Hierarchy.