The Greek poet Homer wrote The Iliad. An epic poet, Homer wrote The Odyssey as well. These epics tell the story of the Trojan War and Odysseus' journey home after the war, respectively. Although historians disagree over the dates of his lifetime, most scholars agree that he was born sometime bewteen 850 and 750 BCE. Some believe that he was a native of Asia Minor while others assert that he was from Chios.
Homer was blind and had his "professional" start as either a story teller or a court singer.
The literary tradition names Homer as the author of both the Iliad and Odyssey; however, modern scholarship debates whether Homer actually existed. We have no concrete information about him, only speculation. It seems clear, however, that the ancient Greeks believed that a blind bard named Homer lived sometime around the 8th century BCE and told of the tales of the great Trojan War.
Also, many scholars agree that an entirely different poet wrote the Odyssey. The linear structure of the Odyssey is completely different, as it goes back and forth in time. Even more noteworthy is that our hero Achilles from the Iliad seems to have done a complete 180 between these two works. In the Iliad Achilles is on a quest for glory. He is after it at any cost. Acheiving glory becomes more important than his own life. When we meet up with Achilles in the Odyssey he says that he made a mistake and he would rather be a nobody on earth than a legend in the underworld. These striking differences has lead scholars to question the authorship of the two poems.
Anyways, there is a long winded answer to your question. Homer is the traditional author of both the Iliad and the Odyssey.
Iliad is the oldest surviving Greek poem, It was written by Homer between 800 and 700 B.C. The poem is about some events that took place in final years of Trojan war that took place between Greece and Troy. Iliad is a big epic running into 24 books and covering events spread over a period of 54 days,
Odyssey which is a sequel to Iliad was also written by Homer. Not much is known about Homer. According to traditions he was blind.
Some scholars believe that Iliad is a collection of short poems composed by several poets rather than the work of only one author.