[Python] What is x_train.reshape() and What it Does?

Using MNIST Dataset

import numpy as np
import tensorflow as tf
from tensorflow.keras.datasets import mnist

# MNIST dataset parameters
num_classes = 10 # total classes (0-9 digits)
num_features = 784 # data features (img shape: 28*28)

(x_train, y_train), (x_test, y_test) = mnist.load_data()

# Convert to float32
x_train, x_test = np.array(x_train, np.float32), np.array(x_test, np.float32)

# Flatten images to 1-D vector of 784 features (28*28)
x_train, x_test = x_train.reshape([-1, num_features]), x_test.reshape([-1, num_features])

# Normalize images value from [0, 255] to [0, 1]
x_train, x_test = x_train / 255., x_test / 255.


At the 15th Line of these Code which is,

x_train, x_test = x_train.reshape([-1, num_features]), x_test.reshape([-1, num_features]). I can't Understand what these reshaping really does in our Dataset..?? Please Explain me.

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