Marvel Comics was a group of superhero comics created by Marvel Corporation, including the Avengers, Spiderman, Iron Man, Thor, Captain America, Black Widow, Hulk, Thor, and the Avengers. These comics were set in a fictional universe and told the story of superheroes protecting the earth and stopping evil forces. Marvel Comics had many fans around the world and were widely used in movies, TV series, games, and other forms of entertainment.
It's a bit of a mixed bag. Some IDW Transformers comics fit neatly into the overall canon, while others might have elements that are more open to interpretation or might not be fully accepted by all fans and official continuity.
Transformers comics are typically seen as canon. But there could be exceptions based on different editorial decisions or story arcs. Generally, though, they contribute to the overall lore and continuity of the Transformers franchise.