With Power Query, you can
Find and connectdata across a wide variety of sources.
Merge and shape data sources to match your data analysis requirements or prepare it for further analysis and modeling by tools such as Power Pivot and Power View.
Create custom views over data.
Use the JSON parser to create data visualizations over Big Data and Azure HDInsight.
Perform data cleansing operations.
Import data from multiple log files.
Create a query from your Facebook likes that render an Excel chart.
Pull data into Power Pivot from new data sources, such as XML, Facebook, and File Folders as refreshable connections.
With Power Query 2.10 and later, you can share and manage queries as well as search data within your organization.