What is IFC-based clash detection for the open-source?

What is IFC-based clash detection for the open-source?

There are chances different companies use different BIM software. So to standardize there output international federation class has been created. (IFC) . All BIM software should have valid IFC data output. So if the architect is using x software and structural engineer is using y software both can be checked for clashes using there IFC outputs.