Here are brief introductions to the top 5 highly rated data science courses on Udemy:

1- "Data Science A-Z™: Real-Life Data Science Exercises Included" by Kirill Eremenko: This course covers the full data science process from data collection to deployment of a model. It covers various tools and techniques including R and Python programming, data preprocessing, data visualization, and machine learning.

2- "Data Science, Deep Learning, & Machine Learning with Python" by Frank Kane: This course focuses on the use of Python for data science, deep learning, and machine learning. It covers key concepts such as data preprocessing, data visualization, and regression analysis. The course also includes hands-on projects.

3- "Machine Learning, Data Science and Deep Learning with Python" by Jose Portilla: This course is a comprehensive introduction to machine learning, data science, and deep learning with Python. It covers various concepts such as supervised learning, unsupervised learning, and deep learning. The course includes hands-on projects and real-world examples.

4- "Python for Data Science Bootcamp" by Pierian Data Inc.: This course is a comprehensive introduction to data science with Python. It covers key concepts such as data preprocessing, data visualization, and machine learning. The course also includes hands-on projects and real-world examples.

5- "Complete Data Science Training: Mathematics, Statistics, Python, Advanced Statistics in Python, Machine & Deep Learning" by 365 Careers: This course covers the complete data science process, from mathematics and statistics to machine learning and deep learning. It covers key concepts such as data preprocessing, data visualization, and machine learning with a focus on real-world applications.