diff --git a/schemas/book.py b/schemas/book.py
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+++ b/schemas/book.py
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+from pydantic import BaseModel, Field
+from typing import Optional
+
+# Base Schema
+class BookBase(BaseModel):
+    title: str = Field(..., description="Book title")
+    description: Optional[str] = Field(None, description="Book description")
+    author: str = Field(..., description="Book author")
+    pages: int = Field(..., gt=0, description="Number of pages")
+
+    class Config:
+        schema_extra = {
+            "example": {
+                "title": "The Great Gatsby",
+                "description": "A novel about the decadence of the Jazz Age.",
+                "author": "F. Scott Fitzgerald",
+                "pages": 180
+            }
+        }
+
+# Schema for creating a new Book
+class BookCreate(BookBase):
+    user_id: str = Field(..., description="ID of the user creating the book")
+
+    class Config:
+        schema_extra = {
+            "example": {
+                "title": "The Great Gatsby",
+                "description": "A novel about the decadence of the Jazz Age.",
+                "author": "F. Scott Fitzgerald",
+                "pages": 180,
+                "user_id": "user123"
+            }
+        }
+
+# Schema for Book responses
+class Book(BookBase):
+    id: int
+    user_id: str
+
+    class Config:
+        orm_mode = True
+```
+
+This code defines three Pydantic models for the Book entity:
+
+1. `BookBase`: A base model that defines the common fields for a book (title, description, author, and pages).
+2. `BookCreate`: A model that inherits from `BookBase` and adds the `user_id` field, which is required for creating a new book.
+3. `Book`: A model that inherits from `BookBase` and adds the `id` and `user_id` fields, which are typically required for API responses.
+
+The `Field` class is used to define validation rules and descriptions for each field. For example, the `title` and `author` fields are required, the `pages` field must be a positive integer, and the `description` field is optional.
+
+The `Config` class is used to provide additional configuration options for each model, such as example values and ORM mode for API responses.
+
+Note that this code assumes that the `user_id` field is a string representing the ID of the user creating the book. If the `user_id` field is a foreign key to the `users` table, you may need to modify the field type accordingly.
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