Explain the concept of the Object class in object-oriented programming.

In object-oriented programming (OOP), the Object class is usually the base class from which all other classes inherit. It defines a basic set of properties and methods common to all objects.

Main ideas:

• Object provides basic functionality, such as methods for comparing objects, obtaining their string representation, cloning, etc.
• Inheritance from Object allows objects to be used in universal data structures and algorithms.
• In C#, the object class (with a lowercase 'o') is the root of the type hierarchy, from which all types, including primitive types, inherit.

Example:

object obj = "Sample string";
Console.WriteLine(obj.ToString()); // Outputs: Sample string

Here, the variable obj of type object contains a string, and we can call the ToString() method, defined in the base Object class.