1 Written interview comprises two sections: Aptitude and Technical. Technical questions are mostly related to Data-Structures, Algorithms, Networking, DBMS.
4 Technical Interviews once the written round is cleared, there would be a series of Technical interviews. Candidates need to be strong with their basics. Questions expected in this round are usually related to OS and Computer Networking, candidates would also be expected to work on codes as well as be interviewed on data present in one's resume.
1 HR Interview normally features questions from your resume, brief explanations about one's self, one's strength and weakness and reasoning behind interviewing for Yahoo.
Where to Prepare
Coding rounds: Material in the programming section of InterviewBit is pretty comprehensive. For your reference, the section below has some of the questions which are frequently asked in Yahoo's Interview. Make sure to try and solve most of them.