The layer in our Data Lake that interacts with the outside world is the serving layer. The layer where data in the lake is served to varied number for people according to the requirement. We will discuss in brief some of the important aspects that needs to be considered in regards to this layer. This layer does employ a number of technologies to help serve data to the end users. Most of the technologie fall in the category of persistent store apt for the data it serves. It can have relational databases, NoSQL databases, document stores, Key-Value stores, Column databases and so on.