Probably it will be off-topic, but anyway I really want to know the difference between this forum and Data Science forum? The both communities are the subparts of StackExchange and at the moment I don't see the reason to split the Data science questions in the two parts (consequently to provide two different communities)...
In my opinion cross-validated concerns the theory and methodology of analysing data, e.g. statistics and machine learning.
Data Science, on the other hand is more hands-on and deals with implementation related topics such as data handling, software infrastructures, databases and toolchains. This is particularly true at the start of Data Science.
That said, there is an increasing gray zone between the two. Data Science is receiving more and more questions that, in my opinion, should end up here instead.