cheers that toast

why do people toast their drinks? 

it can seen on any special occasions, most commonly weddings still. but it is the same as 'cheers'?

apparently not... even though both involves clicking of glasses, and i didn't really know the difference. just saying the sentence made me realise its not the same. toast is an expression of honour and goodwill, it usually comes with a speech of congratulation, good wishes and remembrance. that is why it's only mention on more important occasions. like... the best-man is gonna make a toast for the new couple, long live or all the best to somebody/something. whereas 'cheersing' someone, is a way of greeting, saying thanks and welcome. it's uses is more of gratitude and acknowledgement. like... thanks for that, nice to meet you or we are finally at our holiday! cheers! anyway, the picture is taken during a farewell gathering for a friend going abroad. we made a toast for him, but we said 'cheers'. any other day before this, it wouldn't sound wrong to me. i wonder does anybody else 'cheers' like we did.