What are camera filters and lens, and Do I really need it?

I am planning to buy a digital camera (not SLR) that has "optional extra lens" and "optional filters". I only take photos of the family and friends on vacation and at gatherings.

The most important filter on your lens is the skylight or UV filter that is used to protect the lens from damage. Most digital "point and shoot" cameras do not take filters in any case. An add-on lens that might come in handy is the wide angle one. There are times when you need to get more in your photo and there is no way to back up any farther. Also when on vacation, we tend to shoot more landscapes and sunrises and sunsets, so an axillary wide angle adapter might just fit into your plans.

If you're only using the camera for snapshots and not for artistic work than you probably should save your money.
Filters are used to filter whatever you don't want out of your picture, such as light or a certain color.

Filters are used primarly to give you different effects or for filtering different lighting situations. Optional lenses are used for different applications such as long distance shots, or portraits.

If you are just taking photos of the family, you probably won't need any extra lenses or filters.

If its not an SLR, there is really no need for extra lenses and filters.