An object is an Entity, for example: car, house , person, time etc. Object can be tangible or intangible.

Lets consider a car (tangible) which is our object . An object has an attribute, behaviour and has a unique Id.

Car has attribute (color, model) , behaviour ( accelerate, brake the car, change gear) and has a unique registration number.

Now , lets take an intangible object example: Time. A time can have attributes like: Year, month, day. A time can have its behaviour set, like set the Year, set the Month, set the day and it can have a unique identifier : Date of birth, date of joining the college, date of creation.