Imagine an organization receives daily sales data in an Excel file.

The file contains:

• Order ID

• Customer

• Product

• Region

• Sales amount

• Order date

You connect the file using Get Data.

Before loading everything into the model, you inspect the available data and determine which tables or sheets are required.

You then prepare the data for analysis.

Later, the organization grows and moves its sales data into SQL Server.

The Power BI report can be redesigned to use the database as its source instead of relying on manually maintained Excel files.

This is why understanding data connectivity is fundamental to Power BI.

💡 Key takeaway

Learning Power BI isn't just about knowing how to create charts.

You need to understand where the data comes from, how Power BI connects to it, how the data is accessed, and what happens when the source changes.

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