MQLs (Marketing Qualified Leads)
The first stage of lead qualification is known as MQLs. Even if someone is qualified at this stage, you are still not 100% sure if this person will buy from you. If a person qualifies for marketing lead criteria it means he/she has taken the initiative to engage with your business, and you can convince him to buy your product or service.
At this stage, you have to be careful of spams and must evaluate every visitor to make sure if he is a potential buyer or just spam sneaking into your business. You can gather personal information about visitors or ask him some questions to ensure he is not spamming.
If someone is really interested in buying your product, he would not have any issue providing information like name, email, company's name, etc.
The marketers use different techniques to qualify someone as leads. They will look at persons' previous buying history, buying behaviours, feedback to questions, etc. Let's suppose you are in the mall looking at random stuff, or window shopping. It is also an example of MQLs; they are interested in products, and they want to know about products, without buying.
It is never guaranteed if MQL would buy a product or not, and in most cases, they don't buy anything. Most of the MQLs are not even regular customers of the business. Even someone who is browsing through your website or downloaded a free ebook can be your qualified lead by marketers.