What is the philosophical significance of existence?

1, yes; When an object exists in a specific time and space, we say that it exists.

For example, electromagnetic waves exist. Without electromagnetic waves, there would be no cell phone.

Existence is not something that can be separated from anything, and existence must be attached to specific objects. Existence is an attribute category, not an entity category.

2. Non-existence or non-existence is nothingness, that is, there is no object in a specific time and space, and we say that the object does not exist.

For example, perpetual motion machines do not exist. The former perpetual motion machine was either a machine that could not move forever or a deceptive machine.