All Saints' Day, known in Germany as Allerheiligen, is a significant religious holiday in the country. It falls on November 1st each year and is a Holy Day of Obligation for Catholics. This is a day meant to honor all saints, both known and unknown, that have attained the beatific vision in Heaven. People commemorate the day by attending church services, lighting candles and saying prayers for deceased loved ones.

Although All Saints' Day is observed across Germany, it's recognized as a public holiday only in certain states. Particularly, it's observed in the states of Baden-Württemberg (BW), Bavaria (BY), North Rhine-Westphalia (NW), Rhineland-Palatinate (RP), and Saarland (SL). In these regions, schools, businesses, and government offices are likely to be closed, allowing families to observe the day together.

In terms of traditions, Germans observe All Saints' Day in a solemn and reserved manner. Many people visit the graves of their loved ones, adorning the graves with lanterns, candles, and flowers which is considered as a symbol of respect and remembrance. Church services on this day often include a special liturgy and hymns in honor of all the saints. Regardless of the quiet nature of the celebrations, All Saints' Day holds a profound significance for the German people, where they take time out of their everyday lives to honor and remember those who have passed on in the faith.