The three colors are occasionally taken to represent the three elements of the revolutionary motto, liberté (freedom: blue), égalité (equality: white), fraternité (brotherhood: red); this symbolism was referenced in Krzysztof Kieślowski’s three colors film trilogy, for example.
In the aftermath of the November 2015 Paris attacks, many famous landmarks and stadiums were illuminated in the flag colors to honor the victims.
Considerable detail regarding earlier flags of France and additional details regarding the modern flag are available elsewhere.