They declare it a hit if: 

• If the batter smartly hits the ball between the four lines into a fair territory
• With a super fast speed, batter reaches the first base or beyond safely
• No involvement of the defense side - they haven't made a mistake that should bring them an out player
• The out is not made on a different baserunner as part of a fielder's choice.

Every point explains that the batter is here to be well appreciated, how he hit the ball hard or positioned it in a way where the defense fielders can't make a routine out.

The Four Types of Hits

According to the experts, hits are further categorized into four types depending on how many bases the batter reaches within that hit in baseball. 

1. Single

Once the batter hits the ball with full force and safely reaches first base, it's called a single. A single hit is the most common one of all. It occurs when the ball gets through the infield and hits the ground, or if the batter swiftly hits the ball so it drops into open space between fielders.

2. Double

Like singles, if you safely reach second base, it's a double. To score a double, the batter strategically hits the ball in the outfield direction so he saves up some extra time to run further.

3. Triple

Next comes the triple. Have you successfully made it to third base on one hit? Great. Triples are rare as batter must be efficient enough not just to hit the ball towards the outfield, but to do so with lightning fast speed and smart base running. 

4. Home Run

Last but not least is the home run. The most cheerful hit. If a batter, with full force, throws the ball over the outfield fence so the ball falls inside the park or in a fair territory, it's a home run. The time here iss enough for him to easily circle all four bases. The batter and any runners already on base, everyone gets a run.