In Python, sequences are ordered collections of items, allowing for iteration and indexing. Common types of sequences in Python include lists, tuples, and strings. Sequences share certain characteristics, such as support for indexing, slicing, concatenation, repetition, and membership testing. Additionally, sequences can be iterated over using loops or comprehensions, providing powerful ways to manipulate and process data. Lists, the most versatile sequence type, allow for mutable operations like adding, removing, and modifying elements. Tuples, on the other hand, are immutable sequences, making them suitable for representing fixed collections of items. Strings are also immutable sequences of characters, providing specialized methods for text processing. Understanding Python sequences is crucial for efficient data manipulation and programming tasks, as they form the basis for many fundamental operations and data structures in Python programming.