Opposition to racism and police brutality has seen people unite around the phrase Black Lives Matter (BLM).
Among those to have shown support are members of the England football team - whose players have been booed by some fans for taking the knee.
What does Black Lives Matter mean?
Black Lives Matter is a phrase, and notably a hashtag, used to highlight racism, discrimination and inequality experienced by black people.
Its use grew in the US after high-profile killings by police, but it has also been used in the UK and elsewhere.
Supporters point to the fact that black people are much more likely to be shot by police in the US. They say that in the US and many other countries, they also suffer many other forms of discrimination.
They want action to address unequal treatment and oppression that goes all the way back to the era of slavery, but which continues today.
Among its main goals are stopping police brutality and fighting for courts to treat black people equally. Its demands for equality also include mental health, the LGBT community and voting rights.
In the US, steps have been taken to tackle police violence and change the way laws are applied.
Following the death of Mr Floyd, the term "defund the police" made headlines. Cities including Minneapolis, Portland, Philadelphia and Seattle have started shifting budgets away from police and into areas like schools and housing.
In the UK, demonstrations drew attention to the UK's colonial past and saw statues of people linked to the slave trade removed.
Black history lessons will be mandatory in all Welsh schools from 2022. In England, Scotland and Northern Ireland, teachers can now choose if they want to teach black history.
Books about issues affecting black people became best sellers.
And, for some people, Black Lives Matter meant starting to have difficult conversations about racism with people they know.