For example, pork is haram (forbidden) to consume. It is not halal to consume.
It is that simple
Allah (the almighty) said in the Holy Quran:
“He (Allah) has only forbidden to you dead animals, blood, the flesh of swine, and that which has been dedicated to other than Allah.”-(The Quran 16:115).
“O’ mankind! eat of what is in the earth lawful and good; and do not follow the footsteps of Satan. Surely he is a manifest foe for you.”-(The Quran 2:168).
Some haram foods are:
And all foods of/in the world are/is halal. Only a few hand-counted foods are haram. We all have a misconception that most of the foods are haram (forbidden) in Islam. It is totally wrong. All foods of/in the world are halal (permissible) to consume. Only a hand-counted few items are haram (forbidden) to consume. And those food items are definitely harmful and wrong for/to us. To know more about it in details, please check this article- https://wordsence.com/2020/04/06/what-is-haram-and-halal-food/
So anyone should only eat halal (permissible) foods. And halal (permissible) foods are right and good to/for us.