Chenopodium album is a Eurasian plant that has established itself across most of the world. But you may well walk by it without noticing.
Chenopodium album is in the plant family, Amaranthaceae, the amaranth or pigweed family. Many places you will see it listed as having its own family, Chenopodiaceae, but recent work merged the Chenopodiaceae into the Amaranthaceae.
The scientific name says "white goose foot", the chen for goose in Greek, podium foot, and album is white. The flowers are whitish, but so are the new leaves (picture above) so while the namer might have meant the flowers, I see white on every plant.