For Loops are essentially loops that run for a specific period. There are two types of for loops. 1 Numeric for loops and generic for loops both have adept value.

Numeric For Loops has a starting, middle and an ending position, e.g.

The first value of a Numeric For Loop has to be less than the first one unless it wouldn't work.

for i = 1,10 do
print (i)
end

OUTPUT: 1 2 3 4 5 6 7 8 9 10

On the other hand, Generic For Loops are useful for looping through objects in the Workspace.

EX: You can loop through the character and get all the descendants (children) of the character's body parts, 1by1.

for i,v in pairs (game.Players:GetPlayers()) do
print (v)
end

Possible Outcome:

It should print every single player in the Workspace.

References:

Here's a video about For Loops.

Refined by JesseSong, fixed grammatical errors. Date: February 20, 2021.

Hello there!

There are two types of for loops. An in pairs loop, and an i = 0, 1 do loop.

i = 0, 1 loops:

The i = 0, 1 do will count down between a certain point.

For example:

for i = 0, 10 do 
    wait(1)
    print(i)
end

The output would say: "1" "2" "3" "4" "5" "6" "7" "8" "9" "10"

That loop will wait 1 second and print "i", which is the current number it's at.

In pairs loop:

The in pairs loop loops through a table until there are no more values left to loop through.

For example:

local myFruitTable = {
    "Apples",
    "Bananas",
    "Grapes"
}

for i, v in pairs(myFruitTable) do
    print(v)
    print(i)
end

The output would say: "Apples" "1" "Bananas" "2" "Grapes" "3".

"V" stands for value, and "I" stands for index. For example, "Apples" has an index of 1, "Bananas" has an index 2, etc. It's basically the order number. "V" is the value. For example, print(v) would print out "Apples", "Bananas", and so on and so forth.

The in pairs loop is also useful using the Instance:GetChildren() function. That function returns a table, which means you could use the in pairs loop on it. For example:

local children = workspace:GetChildren()

for i, v in pairs(children) do
    v:Destroy()
end

That would destroy the children of workspace. You could've also used the Instance:ClearAllChildren() function.

Please accept and upvote my answer if it helped.

A for loop can be used for counting between integers. EG:

for count = 1, 5 do
    print(count)
end

Essentially, it checks each 'point' between two given values.