Here is how to insert a chart or graph from Excel into PowerPoint:

1. Open the Microsoft Excel file that contains the graph you want to insert.
2. Select the chart or graph you want to use.
3. Select the Home tab. Click Copy on the ribbon.
4. Open the Microsoft PowerPoint file you want to insert the graph to.
5. Click the Home tab. Click Paste on the ribbon.
6. Choose Paste Special and select an object type to embed in your document.