Can you explain what the use of Fluent API means in API development?

Fluent API is a style of designing software interfaces where methods are called in a chain, returning an object, which allows for more readable and expressive code. Typically, methods return a reference to the current object (this), enabling multiple methods to be called in sequence without repeatedly specifying the object.

Example in C#:

var builder = new StringBuilder()
    .Append("Hello")
    .Append(" ")
    .Append("World!");
string result = builder.ToString();

Here, each call to Append returns the StringBuilder object itself, allowing for a chain of calls. This approach improves readability and simplifies object configuration.