The resurgence of the far-left Left Party, as well as a historic result for the far-right AfD, demonstrates growing support for the extremes as the outlook for Europe's largest economy darkens and the arrival of millions of migrants polarises society.

Germany took a huge step to the right. The conservative Christian Democrats (CDU) ran a campaign focused on law and order and halting immigration — and overtook Chancellor Olaf Scholz’s Social Democrats (SPD) as the largest party in the Bundestag,

With a week left to Germany's snap polls to the parliament, both the AfD on the far-right and BSW on the far-left could offer a stiff challenge to mainstream political parties. Here is what to know.