Infosys Mern Full Stack Developer Interview Questions and Answers

Q1. What is virtual DOM?
Ans. 
Virtual DOM is a lightweight copy of the actual DOM that allows for efficient updates and rendering in web applications.
• Virtual DOM is a concept used in frameworks like React to improve performance by minimizing direct manipulation of the actual DOM.

• When changes are made to the virtual DOM, a comparison is done with the actual DOM to identify the minimal number of updates needed.

• This approach reduces the number of DOM ...read more
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Q2. What is foriegn Key SQL?
Ans. 
Foreign key in SQL is a field in a table that is a primary key in another table, establishing a relationship between the two tables.
• A foreign key constraint ensures referential integrity between two related tables.

• It helps maintain consistency and avoid orphan records.

• Example: In a database with tables 'orders' and 'customers', the 'customer_id' in 'orders' table can be a foreign key referencing the 'id' column in 'cus
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Q1. What is props
Ans. 
Props are read-only properties that are passed from a parent component to a child component in React.
• Props allow data to be passed down the component tree.

• Props are immutable and cannot be changed by the child component.

• Props are accessed in the child component using this.props.
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Q2. What is Good feedback you ever got in during you development period.
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