Low latency data access Vs High throughput of data

[Raj Hadoop]

Hi,

I have a basic question on HDFS. I was reading that HDFS doesnt work well with 
low latency data access. Rather it is designed for the high throughput 
of data. Can you please explain in simple words the difference between 
"Low latency data access Vs High throughput of data".


Thanks,
Raj