Optimism (noun)

1. A hopeful and positive attitude towards the future or towards the outcome of something.
2. The belief that good things will happen in the future.

Origin:

The word "optimism" comes from the latin word "optimus" which means "best" or "most favorable" and the greek suffix "-ism" which means "condition". it was first used in english in the early 1700s.

Examples:

1. His optimism helped him to overcome many challenges and to achieve his goals.
2. Despite the difficult situation, she maintained an optimism that things would get better.
3. The optimism of the investors was reflected in the stock market's steady climb.
4. His optimism is contagious and it makes everyone around him feel better.
5. I try to approach each day with a sense of optimism, knowing that good things can happen.