Convolutional Neural Networks (CNNs) are a specialized class of deep neural networks tailored for processing high-dimensional data, excelling in tasks like image classification, object detection, and facial recognition. Their architecture is built on convolutional layers interspersed with pooling layers, which efficiently extract hierarchical features while reducing computational complexity. Convolutional layers utilize filters to detect patterns such as edges or textures, employing shared weights to enhance translational invariance and reduce the number of parameters. Pooling layers further simplify feature maps by downsampling, preserving critical information while minimizing spatial dimensions. Prominent architectures, including LeNet, AlexNet, VGGNet, and ResNet, have set benchmarks in image recognition and inspired advancements in deep learning. The careful tuning of hyperparameters, such as filter size, stride, and padding, plays a pivotal role in optimizing performance, balancing accuracy with computational efficiency. CNNs continue to drive innovation, expanding their applications across diverse fields like natural language processing, speech recognition, and autonomous systems.