Stands for Document Cloud, which integrated Adobe's cloud storage and mobile app ecosystem with traditional desktop editing tools.
The "Pro" version is the premium tier, offering more advanced capabilities than the free Adobe Acrobat Reader DC or the Standard version. These include editing text and images directly within a PDF, converting PDFs to and from other formats, creating and filling forms, applying advanced security features, and much more. Stands for Document Cloud, which integrated Adobe's cloud
If you need the features found in the 2015 build, the safest path is to use the modern equivalents provided by Adobe. Technology has moved far beyond the 2015 version, and the current Acrobat Pro offers better performance and security. Stands for Document Cloud
Adobe Acrobat Pro DC 2015.023.20053 is recommended for: creating and filling forms