  ROOT is high energy physics' software for storing and mining data in a
statistically sound way, to publish results with scientific graphics. It is
evolving since 25 years, now providing the storage format for more than one
exabyte of data; virtually all high energy physics experiments use ROOT. With
another significant increase in the amount of data to be handled scheduled to
arrive in 2027, ROOT is preparing for a massive upgrade of its core
ingredients. As part of a review of crucial software for high energy physics,
the ROOT team has documented its R&D plans for the coming years.
