Find Interview Questions for Moglix

Right Answer:
API authentication is the process of verifying the identity of a user or application trying to access an API. Common methods include:

1. **API Keys**: Unique keys provided to users to access the API.
2. **Basic Authentication**: Uses a username and password encoded in Base64.
3. **OAuth**: A token-based authentication method that allows users to grant limited access to their resources without sharing credentials.
4. **JWT (JSON Web Tokens)**: A compact, URL-safe means of representing claims to be transferred between two parties, often used for stateless authentication.
5. **HMAC (Hash-based Message Authentication Code)**: Uses a secret key to create a hash of the request, ensuring data integrity and authenticity.

Right Answer:
A web service is a standardized way of allowing different applications to communicate over the internet using protocols like HTTP. It provides a method for applications to exchange data and perform operations. An API (Application Programming Interface) is a set of rules and tools that allows different software applications to interact with each other. A web service is a type of API that specifically uses web protocols to enable this interaction.

Right Answer:
Synchronous API calls wait for the response before moving on to the next task, while asynchronous API calls allow the program to continue executing other tasks while waiting for the response.

Right Answer:
CORS, or Cross-Origin Resource Sharing, is a security feature implemented by web browsers that allows or restricts web applications from making requests to a domain different from the one that served the web page. It affects API development by requiring developers to configure their APIs to specify which origins are allowed to access their resources, ensuring that only trusted domains can interact with the API.

Right Answer:
Rate limiting in APIs is a technique used to control the number of requests a user can make to an API within a specific time period. It is implemented by setting thresholds (e.g., requests per minute) and using mechanisms like tokens, counters, or IP address tracking to monitor and restrict access when the limit is exceeded.

Right Answer:
Some common data analysis tools and software include:

1. Microsoft Excel
2. R
3. Python (with libraries like Pandas and NumPy)
4. SQL
5. Tableau
6. Power BI
7. SAS
8. SPSS
9. Google Analytics
10. Apache Spark

Right Answer:
Clustering in data analysis is the process of grouping similar data points together based on their characteristics, without prior labels. It is an unsupervised learning technique. In contrast, classification involves assigning predefined labels to data points based on their features, using a supervised learning approach.

Right Answer:
Exploratory Data Analysis (EDA) is the process of analyzing and summarizing datasets to understand their main characteristics, often using visual methods. It helps identify patterns, trends, and anomalies in the data before applying formal modeling techniques.

Right Answer:
Descriptive statistics summarize and describe the main features of a dataset, using measures like mean, median, mode, and standard deviation. Inferential statistics use sample data to make predictions or inferences about a larger population, often employing techniques like hypothesis testing and confidence intervals.

Right Answer:
Classification analysis is a data analysis technique used to categorize data into predefined classes or groups. It works by using algorithms to learn from a training dataset, where the outcomes are known, and then applying this learned model to classify new, unseen data based on its features. Common algorithms include decision trees, logistic regression, and support vector machines.

Right Answer:

I incorporate feedback by regularly reviewing customer interactions, analyzing sales data, and seeking input from colleagues. I identify patterns in what works and what doesn’t, adjust my strategies accordingly, and continuously test new approaches to enhance my cross-selling effectiveness.

Right Answer:
A payment gateway is a service that processes online payments for e-commerce transactions. It securely transmits customer payment information from the website to the payment processor and then returns the transaction results back to the website. It functions by encrypting sensitive data, authorizing payments, and ensuring that funds are transferred from the customer's account to the merchant's account.

Right Answer:

Active listening helps in cross-selling by allowing the salesperson to understand the customer's needs and preferences better, enabling them to suggest relevant products or services that complement what the customer is already interested in.

Right Answer:
The key components of an e-commerce website are:

1. User Interface (UI) and User Experience (UX) Design
2. Product Catalog
3. Shopping Cart
4. Payment Gateway
5. Order Management System
6. Customer Account Management
7. Security Features (SSL, Data Protection)
8. Mobile Responsiveness
9. Search Functionality
10. Customer Support (Chat, FAQs, Contact Information)

Right Answer:
SEO (Search Engine Optimization) in e-commerce helps improve the visibility of an online store in search engine results, driving organic traffic to the website. It involves optimizing product descriptions, images, and site structure to rank higher for relevant keywords, ultimately increasing sales and customer engagement.

Right Answer:
An Inner Join returns only the rows that have matching values in both tables, while a Full Outer Join returns all rows from both tables, with matching rows from both sides where available, and NULLs where there are no matches.