Before moving forward with the comparison it is important to understand what ABM and traditional B2B marketing are and which processes they include.
ABM on the other hand is a strategic marketing technique of marketing a definite account by incorporating a unique targeted marketing message to it. It is a marketing model which aims at synchronizing marketing and sales efforts based on targeted accounts while at the same time taking a broad approach.

B2B marketing has however been widely classified as a broader concept of marketing where companies embark on general marketing strategies that address a huge number of consumers. This usually uses strategies like content marketing, email marketing, trade shows, and advertising to identify potential Leads and take them through the Sales Funnel Process.

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https://salesmarkglobal.com/abm-and-traditional-b2b-marketing/