The Digital Cinema Package (DCP) has evolved over the years. This year, 2019, to be exact April, is transition to SMPTE-DCP as the default for distribution going forward.
Depending on who you are and the type of content you are producing, taking a different path to producing a DCP can be beneficial. In this video I cover the current day best path for each of the most common requirements.
This is a great update on what you should know if targeting DCP for distribution.