A special resolution relates to a matter that is outside the ordinary day to day matters of a company whereas …
… an ordinary resolution relates to ordinary everyday type of matters that face a company
By (quasi) statutory definition, a special resolution is passed by a majority of not less than 75% voting in favour of a resolution at a meeting of which not less than 14 days notice has been given specifying the resolution as a special resolution
An ordinary resolution is simply passed by a majority of votes in favour of the resolution