The difference between the Linux shell de-uniq and sort

Sort-u and Uniq can play the role of removing duplicate information, so where is the difference between them?
$ cat Test
Jason
Jason
Jason
Fffff
Jason

The following three commands are executed separately

1:sort-u Test

Sort-u Test
Fffff
Jason

2:uniq Test

$uniq Test
Jason
Fffff
Jason

3:sort Test|uniq

$sort Test |uniq
Fffff
Jason

From the above three commands we can easily see the difference between them. Uniq so-called repetition is the same record that appears consecutively.

The difference between the Linux shell de-uniq and sort