Ekadasi is the eleventh day of the waxing and waning moons. Like the Judeo-Christian Sabbath, it is a day for increased concentration on God. Ekadasi is called Hari Vasara, “the day of Lord Hari [a name for Krishna].”
On Ekadasi, Krishna devotees either fast or simplify their meals and abstain from eating grains and beans. Fasting on holy days, a traditional Bhakti practice, is a sign of one’s dedication to the spiritual path. When offered in devotion, it helps speed up one's progress in Bhakti.
Besides fasting on Ekadasi, devotees increase their chanting, reading of scripture, prayer, and other services to the Lord.