Question

what is the difference between will and shall?

Answer 1

the difference between will and shall is that will be used for second and third person where has shell is used for first person such as we shall go for the party
she will be there

Answer 2

Shall and will both gives the same sense. Both denotes future tense.
Although Shall is used after I and we but in some case if there is some necessary activity there will is also used after I and We.
And Will is used everywhere except I and we but in some case Will is also used before I and We but only if there is strong desire.