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The definition of macroevolution is a large-scale change in the evolution of a species. An example of macroevolution is when feathers appeared on some dinosaurs evolving into birds. large-scale and long-range evolution involving the appearance of new genera, families, etc. of organisms.
Microevolution is the change in allele frequencies that occurs over time within a population. This change is due to four different processes: mutation, selection (natural and artificial), gene flow, and genetic drift. This change happens over a relatively short (in evolutionary terms) amount of time compared to the changes termed 'macroevolution' which is where greater differences in the population occur.