In Japanese there is a term Jiriki. Jiriki means ' self power '. Ultimately it means the power of Buddha Nature.
It is the approach to Buddhadharma that is most familiar to westerners. The idea that in order to manifest our Buddha
Nature we must rely on nothing outside our selves. That we reach Buddhanature or Awakening by our own efforts.
However there is another very important concept in Japanese Buddhism, Tariki. Which means 'other power '..specifically the power of Amitabha Buddha..( Amida in Japanese. )
In ancient times Amitabha made a vow not to realise Nirvana until all sentient beings had also realised Nirvana.
Therefore the Pure Land practitioners call on the name of Amitabha to fulfil his vow for them.
In Japan and among the huge worldwide Chinese Community, as well as in Vietnam,and Cambodia, Pure Land is by far the largest Buddhist school.
There are more Pure Land Buddhists than all the other schools put together.
It is also very popular in the Tibetan community.
The Buddhist pioneer D.T. Suzuki predicted that Pure Land would one day be the largest Buddhist school in the west..because its practice ( recitation of a mantram to Amitabha ) can be as easily done in traffic or at work as in a mountain cave.
At a more subtle level he thought that Pure Land would solve the ever existing problem for western educated people, that the very upayas skillful means, that Jiriki uses can actually strengthen the western ego...The phenomenon that Chogyam Trungpa Rinpoche called " Spiritual Materialism ".
The idea of surrendering to 'other power' undermines the whole edifice on which the western view of the 'individual' is based.
Ultimately he said, the recitation of Amithaba's name is a far more practical way of reaching Right Samadhi .. absorption than attempts to develop jhanas.
I know that some members such as @dharmamom are knowledgeable about Pure Land through the works of modern Pure Land teachers Like Dr.David Brazier..I would particularly welcome their views.