Assimilation means that migrants must adapt as much as possible and adopt the national culture. Requiring them to adopt the majority's language, customs and 'values'.
Assimilation means absorbing minorities into the ways of the majority.
Integration mens that migrants take an active part in society.
Integration, by contrast, requires acceptance of a country's laws, of human rights such as freedom of speech, and of basic democratic rights, but does not require the eradication of all cultural differences or group-identities; it is conceived of as a two-way process, through which both the majority and the minorities influence and change one another, and in which differences can be peacefully accommodated as long is there a common commitment to living together.
The word segregation means separation. Segregation is separation of humans into (ethnic) groups in daily life.
The word segregation means separation. Segregation is separation of humans into (ethnic) groups in daily life.