Transparent Objects: If you are able to see clearly through an object, it is allowing light to pass through it and is transparent. For example: water, clear glass etc.
Opaque Objects: If we cannot see through an object at all, it is an opaque object. For example: wooden door, wall etc.
Translucent Objects: There are some objects through which we can see, but not very clearly. Such objects are known as translucent. For example: Butter paper, ground glass etc.