I could not possibly write anything better than what is already out there, so here’s a brief explanation.

Montessori is an approach to life and education that allows for discovery through the senses, supports independence at every stage, and allows for curiosities. ?Montessori embraces freedom, nature, harmony, and order.

It does not trump larger ways of living?like our Christianity, but guides us in making educational and environmental choices.

Montessori is what you make it!

Aubrey at Montessori Mischief offers an excellent explanation of Montessori here:
http://montessorimischief.com/montessori-101-the-basics/