"gdal111.dll" is a Dynamic Link Library (DLL) component of the Geospatial Data Abstraction Library (GDAL) provided by the Open Source Geospatial Foundation (OSGeo). GDAL is an open-source library that allows developers to access and manipulate various raster geospatial data formats. "OGR" in the description stands for "Simple Features Library" and is a part of GDAL dedicated to vector data manipulation.
The DLL "gdal111.dll" is essentially a compiled version of the GDAL library for the Windows operating system. When an application in Windows needs to perform operations related to geospatial data, it might rely on functions and procedures housed within this DLL. This modular approach means that multiple applications can share the capabilities of the GDAL library without each having to include its own copy of the library's code.
If you come across this file, it's likely because you have GIS (Geographic Information System) or other geospatial software installed on your system that relies on the GDAL library for data processing and conversion. It's crucial to ensure that the DLL version matches the requirements of the software to prevent compatibility issues.