title: What is meant by sequential model in Keras
body: <p>I have recently started working Tensorflow for deep learning. I found this statement <code>model = tf.keras.models.Sequential()</code>  bit different. I couldn't understand what is actually meant and is there any other models as well for deep learning?
  I worked  a lot on MatconvNet (Matlab library for convolutional neural network). never saw any sequential definition in that.</p>