Hanukkah is a very important festival for the Hebrews, as this commemorates a significant time in the rededication of the Second Temple in Jerusalem. After Antiochus IV gave a decree that all Jewish religious practices were forbidden, the Jews revolted.
He attacked the Temple, destroyed the Jewish holy scrolls, ordered houses to be burnt down, many people were killed, and some put in slavery. Mattathias, who was a former Jewish priest, triggered the rebellion after killing a Syrian Soldier who tried to force him to make an offering to Zeus.
Judas Maccabeus, son of Mattathias, and others led the battle and won over the Syrian army. The temple is the most important place for the Jews. Hanukkah is celebrated to celebrate the rededication of the temple.
Some people refer to Hanukkah as Chanuka, but the fact still remains that this is said to be one of the most important holidays of the Jews. This celebrates the rededication of the second temple in Jerusalem even before Christ was born. This explains why you cannot find any details about this tradition or this holiday when you read the Old Testament of the Bible.
This also celebrates the time when the Jews were able to win against their oppressors during the Maccabean Revolt. The Hanukkah is a celebration of the victories and the triumphs of the Jews, which they feel have created a huge impact on their beliefs right now.