Search Engine Marketing
Search Engine Marketing is also Known as SEM . It is the type of Digital Marketing. Basically SEM refers to the online advertising. Any one can increase traffic by using the SEM. Different forms of the SEM drive traffic towards the product. Hence, online promotion is done to increase the any product sale. SEM can be define as follows also:

You can do the Search Engine Marketing by using the Google Adwords Tool and Microsoft Bing Ad-Center mainly.
It can be achieve by using it's different forms like:
SEO
PPC
Digital Marketing
In simplistic terms, digital marketing is the promotion of products or brands via one or more forms of electronic media.
The promotion of products or brands via one or more forms of electronic media. For example, advertising mediums that might be used as part of the digital marketing strategy of a business could include promotional efforts made via the Internet, Social media, mobile phones and electronic billboards, as well as via digital and television and radio channels.
These days, Online Marketing is the best way to increase your product's brand awareness, as well as it also increases the sell of the particular product. Today, as we all know that this is the internet era. Most of the part of the world is connected with the internet. So it is essential to advertise your product in the digital world.
Hence, Digital Marketing is the way of advertising your product online. Every business/Company has to advertise their product whether it is product based or process based.
Ways to do Digital Marketing
Digital Marketing can be done in the following ways :-
Search Engine Marketing
Mobile Marketing
Email Marketing
Ecommerce Marketing
Content Marketing
Affiliate Marketing
Radio Marketing
Social Media Marketing
Google Adsence Advertising
Blogging