In Islam, halal means 'lawful' or 'permissible'. 

When it comes to meat and poultry, Muslims use the term zabiha (dhabiha) to refer to meat from a halal animal slaughtered by a Muslim in the prescribed Islamic way. (Meat from haram animals does not become halal, even if it is slaughtered in the prescribed Islamic way and a Muslim would never slaughter a haram animal.)

Conversely, kosher is a term similar to the meaning as halal, but there are many differences. Some of the differences are listed below:

Islam prohibits all intoxicants, including alcohols, liquors and wines, whereas Judaism regards alcohol and wines as kosher. Hence kosher foods may contain alcohol. If they do, they are considered haram in Islam.

Gelatin is considered kosher by many Jews regardless of its source of origin. For Muslims, if gelatin is prepared from swine it is haram. Even if gelatin is prepared from cows that are not zabiha, many scholars consider it haram.

Kosher practice does not require Jews to pronounce the name of God on the animals while slaughtering, but Muslims must pronounce the name of ALLAH on all animals while in the act of slaughtering.

There are other differences between halal and kosher that make some kosher products haram or questionable with respect to Muslim consumption. 

These differences may seem minor to some. However, indulging in acts that is haram is a very serious offense against ALLAH. Consuming alcohol or pork is a clear violation of ALLAH's commandments and should not be taken lightly. The pronouncement of the name of ALLAH at the time of slaughter is an act of worship and obedience in its own right. Not only is this pronouncement an act of worship of the most high unto itself, it also is the key to many blessings and bounties.