📚 Frequently Asked Pandas Interview Questions (Beginner Level)

1️⃣ What is the difference between a Series and a DataFrame?

💡 Answer:

Series → A one-dimensional labeled array.

DataFrame → A two-dimensional table with rows and columns.

2️⃣ How do you find missing
values in a DataFrame?

💡 Answer:

df.isnull().sum()
This returns the number of missing values in each column.

3️⃣ What is the difference between loc and iloc?

💡 Answer:

loc → Label-based indexing.

iloc → Integer position-based indexing.

4️⃣ What is the difference between merge() and concat()?

💡 Answer:

merge() combines DataFrames using a common key (similar to an SQL JOIN).

concat() combines DataFrames by stacking them vertically or horizontally.

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