It is a type of meet and greet session in which interviewer ask the questions related to the job you're applying for. Walk in interview is very fast pace face-to-face Q/A session. Walk in interview is happen when company required huge number of employees. Walk in Interview is not scheduled and help without any prior appointment but some companies mention Interview Date, Timings and Venue. You have to come up with your updated CV, Academic Documents/Certificates, Passport size photo, etc.
This strategy can be used for any kind of job like Sales, Accountant, Driver, Customer Service and many more. If you want to apply for a walk in interview jobs, you can find here: https://www.247jobsindubai.xyz/walk-in-interview-in-dubai
Note: Don't forget to read the job requirements/description given on the website. And only apply to that job which meets your qualification or skills.