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Ques:- What is API versioning and why is it important
Right Answer:
API versioning is the practice of managing changes to an API by assigning version numbers to different iterations of the API. It is important because it allows developers to introduce new features or make changes without breaking existing client applications that rely on older versions, ensuring backward compatibility and a smoother transition for users.
Ques:- What is API authentication and what are common methods
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.
Ques:- What is an API endpoint and how do you define it
Right Answer:
An API endpoint is a specific URL or URI where an API can be accessed by a client to perform operations like retrieving or sending data. It defines the location and method (such as GET, POST) for interacting with the API.
Ques:- What are the common status codes in HTTP responses
Right Answer:
The common status codes in HTTP responses are:

- **200**: OK
- **201**: Created
- **204**: No Content
- **400**: Bad Request
- **401**: Unauthorized
- **403**: Forbidden
- **404**: Not Found
- **500**: Internal Server Error
- **502**: Bad Gateway
- **503**: Service Unavailable
Ques:- What is the role of an API Gateway in microservices architecture
Right Answer:
An API Gateway acts as a single entry point for clients to access multiple microservices, handling requests, routing them to the appropriate services, managing authentication, rate limiting, and aggregating responses.
Ques:- What are the steps involved in data cleaning
Right Answer:
1. Remove duplicates
2. Handle missing values
3. Correct inconsistencies
4. Standardize formats
5. Filter out irrelevant data
6. Validate data accuracy
7. Normalize data if necessary
Ques:- What is the difference between supervised and unsupervised learning
Right Answer:
Supervised learning uses labeled data to train models, meaning the output is known, while unsupervised learning uses unlabeled data, where the model tries to find patterns or groupings without predefined outcomes.
Ques:- What are outliers and how do you handle them in data analysis
Right Answer:
Outliers are data points that significantly differ from the rest of the dataset. They can skew results and affect statistical analyses. To handle outliers, you can:

1. Identify them using methods like the IQR (Interquartile Range) or Z-scores.
2. Remove them if they are errors or irrelevant.
3. Transform them using techniques like log transformation.
4. Use robust statistical methods that are less affected by outliers.
5. Analyze them separately if they provide valuable insights.
Ques:- What is exploratory data analysis (EDA)
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.
Ques:- What is data normalization and why is it important
Right Answer:
Data normalization is the process of organizing data in a database to reduce redundancy and improve data integrity. It involves structuring the data into tables and defining relationships between them. Normalization is important because it helps eliminate duplicate data, ensures data consistency, and makes it easier to maintain and update the database.
Ques:- What Are The Benefits Of Social Media Marketing For My Company?
Right Answer:
Social media marketing benefits your company by increasing brand awareness, engaging with customers, driving website traffic, generating leads, improving customer insights, and enhancing customer loyalty.
Ques:- What is the difference between sales & marketing?
Right Answer:
Sales is the process of directly selling products or services to customers, while marketing involves creating awareness and interest in those products or services to attract potential customers.
Ques:- What are the main factors that can affect PPC bidding?
Right Answer:
The main factors that can affect PPC bidding include:

1. Keyword competition
2. Quality Score
3. Ad relevance
4. Landing page experience
5. Bid strategy
6. Budget constraints
7. Target audience and demographics
8. Time of day and seasonality
9. Geographic location
10. Device type (mobile vs. desktop)
Ques:- What are the best ways to get a natural backlink to a site?
Right Answer:
1. Create high-quality, valuable content that others want to share.
2. Guest blog on reputable sites in your niche.
3. Engage with influencers and industry leaders on social media.
4. Participate in relevant online communities and forums.
5. Offer free tools, resources, or infographics that others can link to.
6. Conduct original research or surveys and publish the findings.
7. Build relationships with other websites for collaboration opportunities.
Ques:- What is the difference between programing language and scripting language.?
Comments
Admin May 17, 2020

The core code of any application is written in a programming
language that is create or at least modified by end
user.(eg.java)
a scripting language is a type of prog. language that allows
control of of s/w application and sometimes used to add the
features and client side checking in a web page.(eg javascript)
both are distinct.eg. suppose in html page, u create some
textboxes, then if u want to apply some validation(email
vali.) on their text at client side or want to add features
like counter, flash images etc in the web page, then
javascript canbe used. but at the server side what to do
with this text or how to handle database, all this is
programmed in core language like java,geerally called prog.
language. but java and javascript are totally different.

Admin May 17, 2020

Script Language is code fragment.it is interpreted.It is dynamically typed.
but the programming language is a compiled language and it is a stand alone application.

Ques:- Is it possible to assign a php variable to javascript ? And also is it possible to fetch the page contents if the url is not under our control ?
Comments
Admin May 17, 2020

Yes ,it is possible by doing like the following:
<?php
$x = 'hai!';
echo "<script>var x = '" . $x . "';</script>";
?>

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