What does "!=" mean? And how is it different than "=="?

Answer 1

!= means not equal to

example: 1!=2
which means that 1 is not equal to 2

if you were to print it:

print (1!=2)
The output would be "True" because the statement is true (1 does not equal 2)
If you were to do this:
print (1!=1)
The output would be False, since 1 does equal 1.

Answer 2

means not equal

Answer 3

'==' means not equal to or equal to

example: '1==2' then the statement is false
and when
2==2 then the statement is true