仏壇/butsudan literally means “Buddhist Altar”.
It is a shrine often found in Buddhist temples.
It is also a common sight in Japanese homes, especially in the countryside.
Often there’s an alcove where a small shrine will be set up.
Family members pray for their ancestors and make offerings.
They can be quite expensive but still the majority of traditional homes have a bustsudan.
For more detail, check out Tofugu’s blog.